Ask Fuzzy: How does an induction cooker work?
You can usually tell whether a device is inefficient by the amount of wasted heat.
An obvious example is the internal combustion engine which burns more than half its fuel doing nothing more than getting hot.
The best that most cars can manage is about 20-40 per cent efficiency. That means 60-80 per cent is wasted. Great if you want to cook sausages, but it doesn't you get anywhere.
Televisions, computers and power charges all get warm to varying degrees and, in each case, that means wasted energy.
Then there are kitchen stoves such as gas and those with old-style heater elements. They certainly get hot but, as with cars, much of that goes into heating itself and the air around it without doing any useful work.
A good indicator that induction cooktops are highly efficient (about 84 per cent) is that the "hot plates" are often cool enough to touch (carefully) shortly after they finish cooking.
The history of electromagnetic induction goes back to 1820 when Danish physicist Hans Christian Oersted discovered that an electric current generates a magnetic field.
Then in 1821 English physicist Michael Faraday made a primitive electric motor by placing a magnet near a piece of wire. When he fed an electric current into the wire, it generated a magnetic field, pushing itself away from the permanent magnet.
In 1831, he flipped the idea around by rotating a coil of wire through a magnetic field to induce an electric current, thus inventing the electricity generator.
MORE ASK FUZZY:
Now we see induction used in electric toothbrushes cradles and wireless phone chargers.
As the name implies, induction stoves work on the same principle.
An alternating current running through the tightly wound metal coil inside a cooking zone induces a high-frequency alternating magnetic field.
That produces whirling electrical currents inside the pan. The repeated magnetising and demagnetising (magnetic hysteresis) turns it into a heater.
The beauty of this is that it heats the pan directly instead of an element and the air around it. If there's no pan on the cooking zone, the cooking zone stays cold.
Although your home power supply alternates at 50Hz, an induction cooktop is 20-40kHz, which is 500 to 1000 times faster.
That offers a couple of advantages. One is that being above the range of hearing, stops any annoying buzzing.
The other is that it prevents your pots from dancing around on the cooktop.
The Fuzzy Logic Science Show is at 11am Sundays on 2xx 98.3FM.
Send your questions to AskFuzzy@Zoho.com; Podcast: FuzzyLogicOn2xx.Podbean.com
You can usually tell whether a device is inefficient by the amount of wasted heat.
An obvious example is the internal combustion engine which burns more than half its fuel doing nothing more than getting hot.
The best that most cars can manage is about 20-40 per cent efficiency. That means 60-80 per cent is wasted. Great if you want to cook sausages, but it doesn't you get anywhere.
Televisions, computers and power charges all get warm to varying degrees and, in each case, that means wasted energy.
Then there are kitchen stoves such as gas and those with old-style heater elements. They certainly get hot but, as with cars, much of that goes into heating itself and the air around it without doing any useful work.
A good indicator that induction cooktops are highly efficient (about 84 per cent) is that the "hot plates" are often cool enough to touch (carefully) shortly after they finish cooking.
The history of electromagnetic induction goes back to 1820 when Danish physicist Hans Christian Oersted discovered that an electric current generates a magnetic field.
Then in 1821 English physicist Michael Faraday made a primitive electric motor by placing a magnet near a piece of wire. When he fed an electric current into the wire, it generated a magnetic field, pushing itself away from the permanent magnet.
In 1831, he flipped the idea around by rotating a coil of wire through a magnetic field to induce an electric current, thus inventing the electricity generator.
MORE ASK FUZZY:
Now we see induction used in electric toothbrushes cradles and wireless phone chargers.
As the name implies, induction stoves work on the same principle.
An alternating current running through the tightly wound metal coil inside a cooking zone induces a high-frequency alternating magnetic field.
That produces whirling electrical currents inside the pan. The repeated magnetising and demagnetising (magnetic hysteresis) turns it into a heater.
The beauty of this is that it heats the pan directly instead of an element and the air around it. If there's no pan on the cooking zone, the cooking zone stays cold.
Although your home power supply alternates at 50Hz, an induction cooktop is 20-40kHz, which is 500 to 1000 times faster.
That offers a couple of advantages. One is that being above the range of hearing, stops any annoying buzzing.
The other is that it prevents your pots from dancing around on the cooktop.
The Fuzzy Logic Science Show is at 11am Sundays on 2xx 98.3FM.
Send your questions to AskFuzzy@Zoho.com; Podcast: FuzzyLogicOn2xx.Podbean.com
You can usually tell whether a device is inefficient by the amount of wasted heat.
An obvious example is the internal combustion engine which burns more than half its fuel doing nothing more than getting hot.
The best that most cars can manage is about 20-40 per cent efficiency. That means 60-80 per cent is wasted. Great if you want to cook sausages, but it doesn't you get anywhere.
Televisions, computers and power charges all get warm to varying degrees and, in each case, that means wasted energy.
Then there are kitchen stoves such as gas and those with old-style heater elements. They certainly get hot but, as with cars, much of that goes into heating itself and the air around it without doing any useful work.
A good indicator that induction cooktops are highly efficient (about 84 per cent) is that the "hot plates" are often cool enough to touch (carefully) shortly after they finish cooking.
The history of electromagnetic induction goes back to 1820 when Danish physicist Hans Christian Oersted discovered that an electric current generates a magnetic field.
Then in 1821 English physicist Michael Faraday made a primitive electric motor by placing a magnet near a piece of wire. When he fed an electric current into the wire, it generated a magnetic field, pushing itself away from the permanent magnet.
In 1831, he flipped the idea around by rotating a coil of wire through a magnetic field to induce an electric current, thus inventing the electricity generator.
MORE ASK FUZZY:
Now we see induction used in electric toothbrushes cradles and wireless phone chargers.
As the name implies, induction stoves work on the same principle.
An alternating current running through the tightly wound metal coil inside a cooking zone induces a high-frequency alternating magnetic field.
That produces whirling electrical currents inside the pan. The repeated magnetising and demagnetising (magnetic hysteresis) turns it into a heater.
The beauty of this is that it heats the pan directly instead of an element and the air around it. If there's no pan on the cooking zone, the cooking zone stays cold.
Although your home power supply alternates at 50Hz, an induction cooktop is 20-40kHz, which is 500 to 1000 times faster.
That offers a couple of advantages. One is that being above the range of hearing, stops any annoying buzzing.
The other is that it prevents your pots from dancing around on the cooktop.
The Fuzzy Logic Science Show is at 11am Sundays on 2xx 98.3FM.
Send your questions to AskFuzzy@Zoho.com; Podcast: FuzzyLogicOn2xx.Podbean.com
You can usually tell whether a device is inefficient by the amount of wasted heat.
An obvious example is the internal combustion engine which burns more than half its fuel doing nothing more than getting hot.
The best that most cars can manage is about 20-40 per cent efficiency. That means 60-80 per cent is wasted. Great if you want to cook sausages, but it doesn't you get anywhere.
Televisions, computers and power charges all get warm to varying degrees and, in each case, that means wasted energy.
Then there are kitchen stoves such as gas and those with old-style heater elements. They certainly get hot but, as with cars, much of that goes into heating itself and the air around it without doing any useful work.
A good indicator that induction cooktops are highly efficient (about 84 per cent) is that the "hot plates" are often cool enough to touch (carefully) shortly after they finish cooking.
The history of electromagnetic induction goes back to 1820 when Danish physicist Hans Christian Oersted discovered that an electric current generates a magnetic field.
Then in 1821 English physicist Michael Faraday made a primitive electric motor by placing a magnet near a piece of wire. When he fed an electric current into the wire, it generated a magnetic field, pushing itself away from the permanent magnet.
In 1831, he flipped the idea around by rotating a coil of wire through a magnetic field to induce an electric current, thus inventing the electricity generator.
MORE ASK FUZZY:
Now we see induction used in electric toothbrushes cradles and wireless phone chargers.
As the name implies, induction stoves work on the same principle.
An alternating current running through the tightly wound metal coil inside a cooking zone induces a high-frequency alternating magnetic field.
That produces whirling electrical currents inside the pan. The repeated magnetising and demagnetising (magnetic hysteresis) turns it into a heater.
The beauty of this is that it heats the pan directly instead of an element and the air around it. If there's no pan on the cooking zone, the cooking zone stays cold.
Although your home power supply alternates at 50Hz, an induction cooktop is 20-40kHz, which is 500 to 1000 times faster.
That offers a couple of advantages. One is that being above the range of hearing, stops any annoying buzzing.
The other is that it prevents your pots from dancing around on the cooktop.
The Fuzzy Logic Science Show is at 11am Sundays on 2xx 98.3FM.
Send your questions to AskFuzzy@Zoho.com; Podcast: FuzzyLogicOn2xx.Podbean.com
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Man of Many
2 days ago
- Man of Many
How Dyson's ‘Problem-First' Mindset Keeps it Ahead of the Game
By Dean Blake - News Published: 4 June 2025 |Last Updated: 3 June 2025 Share Copy Link Readtime: 8 min Every product is carefully selected by our editors and experts. If you buy from a link, we may earn a commission. Learn more. For more information on how we test products, click here. When you think of innovative companies—I mean truly innovative companies—there are really only a few that spring to mind. Apple, with its reinvention of the consumer electronics space during the Steve Jobs era, and Amazon's shift from redefining how we sell books online to how we sell everything online being two massive examples of what it takes to be considered an innovator in today's markets: and yet, I would say that when it comes to hardware innovation, few brands can stand toe-to-toe with Dyson. Between re-imagining the vacuum cleaner into a new industry standard of bagless, cyclonic devices that run smoother and are easier to operate—with the recent announcement of the PencilVac taking that concept to its natural conclusion: a broom with a vacuum in the brush head—the English-born business has also taken aim at other analogous industries ripe for new ideas: hair dryers and straighteners, air purifiers, and even headphones. What is it that ties all these efforts together? Simply put: it's a focus on problem-solving embedded deep in the DNA of the company. Dyson founder Sir James Dyson working in his studio | Image: Dyson Problems first, solutions second When Sir James Dyson initially invented the business' foundational cyclonic vacuum technology back in 1991, it wasn't out of some great brainwave or realisation that this was the future of consumer vacuums. Rather, it was due to his own personal frustration with the then-industry standard. 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Necessity, they say, is the mother of all invention, and to say this invention revolutionised the vacuum space is an understatement: try and find a vacuum cleaner that requires a bag these days and you'll find it impossible, and it comes down to one thing. Dyson saw a problem, solved it, and sold the solution—and this is still how the company operates today. Sir James Dyson with the Dyson PencilVac, showcasing the motor | Image: Dean Blake/Man of Many ' exactly the same,' Sir James Dyson tells us. 'We're engineers and we want to develop technology and make better products using that technology, and that's exactly what we do today.' It is, in fact, the business' mission statement: a focus on solving the problems that others have ignored with technology and ingenuity. Part of that focus comes from the fact the business has never gone public. Rather than answer to a board of shareholders, Dyson (the company) really only answers to Dyson (the man) and its customers. 'We don't have a CEO that comes in to run the company and then leaves, and then a new CEO comes in and does things differently. It's the same old me with the same philosophy: not to get big or make money, but to make interesting products,' he says. The other key to Dyson's success is in having the space to create a culture of innovation within the company: fundamentally, it's a company-wide mindset that sets the business apart from its competition, Dyson's head of home Tom Moody explains. 'We have lots of creative and inventive people looking for new problems to solve, or creative ways they can apply themselves. I think that's what pushes us forward,' Moody says. ' has to solve a problem. In some places there might be a more clear 'here is what we want, go ahead and engineer it', but that's not the Dyson way. For us, it's more about 'here's what we discovered in our customers' homes', some frustrations they're facing, and giving our engineers the space to explore that. 'That gives them the latitude and license to create.' Dyson PencilVac | Image: Supplied Merging form and function You'd be forgiven for hearing all that and then thinking: well then why aren't Dyson's products over-engineered? In fact, Dyson's products often strike a near-perfect balance between aesthetics and functionality—delivering the performance and features you want from a vacuum cleaner, hair dryer, straightener, or air purification system, but in a package you're happy to showcase to friends and family. This largely comes from the company's focus on keeping all product staff involved in the product design process from the beginning. Moody notes that even at conceptual stages, engineers are often in contact with the brand's innovation department, as well as its design team, in order to ensure the company hits a balance between solving a problem and creating new ones. 'That ensures that we don't get to a stage later in a product's process where we say 'we've engineered a solution, but it's big, bulky, and it'd never be accepted by a customer',' he explains. 'We try to bake it in at an early stage during the design process.' And while it's rare, there are instances of the business putting the cart before the horse a little, and actively dictating the form of a product before the engineers have even had time to conceptualise a solution: case in point, the PencilVac. While Dyson made its name in miniaturising an industrial cyclonic cleaner into something customers could drag around their homes, its next bet is on cramming the concept of a vacuum into a simple tool: a broom. It's something Sir James Dyson has wanted to create for a while, but hadn't been able to crack the size-to-performance barrier: until now. Dyson PencilVac | Image: Supplied How did they do it? By throwing out their vacuum technology almost entirely, and leaning instead on the smaller motors used in the creation of their SuperSonic Hair Dryer products. While it's an upgraded and reinvented version of the V9 motor (now known as the Dyson Hyperdymium motor), it's fundamentally the same bit of tech used in the SuperSonic R, down to the size of the broom handle mimicking the size of the hair dryer exactly to ensure the motor functions as expected: 38 millimetres. No more, no less. 'James had long desired to create something that was in a very, very slim format and the size, 38 millimetres, is obviously very linked specifically to the enabling technology that we have,' Moody explains. 'We spent many years designing the V9 motor to try to get something to fit within that package, and so it's really an extension of that logic. It's something that's ergonomic and comfortable for our customers to use.' 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While Dyson has entered a number of new categories, and intends to launch into more, it never bets on products being a huge success out of the gate. 'When you launch a new product you never know that you're going to sell it—I don't know that the PencilVac will sell well,' Dyson explains. 'It's all a risk, but if you stick to the principle that what you're trying to do is solve problems and make something easier to use, even if it's in a new category, you can make headway because you believe what you've done is a genuine improvement. 'You just have to have faith and hope it works.' Disclaimer: The author of this article, Dean Blake, was invited to test the Dyson PencilVac and talk to Sir James Dyson and Tom Moody at a Dyson event in Tokyo, Japan.
The Advertiser
2 days ago
- The Advertiser
Ask Fuzzy: Who was Sister Elizabeth Kenny?
In June 1916, New York officially declared a polio epidemic and, in doing so, instigated a practice that we might find unacceptable today. Newspapers published the names and addresses of sufferers, placards were nailed to doors, and families quarantined. Australians too, were affected. Polio became a notifiable disease in Tasmania and other states by 1922. Despite these measures, polio incidents continued to rise until 1938, when in Australia the number of cases peaked at 39 per 100,000. Polio, sometimes called infantile paralysis, is a devastating disease that causes muscle fatigue and spasms in the limbs, often accompanied by severe pain. When Elizabeth Kenny first encountered the disease, the accepted practice was to immobilise the patient. With splints and plaster body casts to prevent muscle tightening, many paralysed patients lay for months at a time. Unfortunately this would often atrophy both affected and healthy muscles. The Australian Elizabeth Kenny (1880 -1952) became something of a maverick by developing what was then considered a radical treatment. In 1913 Kenny opened a small hospital in Queensland, where her method was reportedly used with success. To ease pain, she lay strips of hot moist cloth over the person's affected areas. And rather than immobilising her patients, she had them do exercises such as bending and flexing joints. Several times a day, they'd move them through a limited range of motion. In doing so, she went directly against the orthodoxy, but her methods are now thought to be a forerunner of modern physiotherapy. However Elizabeth Kenny remains a tricky subject. In some ways, she resembles today's self-appointed heroes who reveal their groundbreaking treatment that busts open the orthodoxy. Kenny appears to have been a skilled self-promoter. She became famous in the United States and her story even featured in a 1946 Hollywood movie. But some saw her as a tireless propagandist who manipulated, or even falsified, her results. She claimed to have achieved an astounding 80 per cent recovery rate, but this was based on observation and intuition rather than any scientific study. MORE ASK FUZZY: Her approach was based on a fundamental misconception that the problem was a muscular one that could be corrected through "muscle re-education". As some researchers thought at the time and has subsequently been proven, polio paralysis is actually a neurological condition. As someone with direct experience of RSI (Repetitive Strain Injury) and Frozen Shoulder (adhesive capsulitis), I cannot imagine a worse treatment than to stop a person exercising. Treatment today is more nuanced. As with the Kenny method, it includes hot moist packs and physical therapy. However, institutions such as the Mayo Clinic also include appropriate bed rest and even "splints or other devices to encourage good position of the spine and limbs". The Fuzzy Logic Science Show is at 11am Sundays on 2xx 98.3FM. Send your questions to AskFuzzy@ Podcast: In June 1916, New York officially declared a polio epidemic and, in doing so, instigated a practice that we might find unacceptable today. Newspapers published the names and addresses of sufferers, placards were nailed to doors, and families quarantined. Australians too, were affected. Polio became a notifiable disease in Tasmania and other states by 1922. Despite these measures, polio incidents continued to rise until 1938, when in Australia the number of cases peaked at 39 per 100,000. Polio, sometimes called infantile paralysis, is a devastating disease that causes muscle fatigue and spasms in the limbs, often accompanied by severe pain. When Elizabeth Kenny first encountered the disease, the accepted practice was to immobilise the patient. With splints and plaster body casts to prevent muscle tightening, many paralysed patients lay for months at a time. Unfortunately this would often atrophy both affected and healthy muscles. The Australian Elizabeth Kenny (1880 -1952) became something of a maverick by developing what was then considered a radical treatment. In 1913 Kenny opened a small hospital in Queensland, where her method was reportedly used with success. To ease pain, she lay strips of hot moist cloth over the person's affected areas. And rather than immobilising her patients, she had them do exercises such as bending and flexing joints. Several times a day, they'd move them through a limited range of motion. In doing so, she went directly against the orthodoxy, but her methods are now thought to be a forerunner of modern physiotherapy. However Elizabeth Kenny remains a tricky subject. In some ways, she resembles today's self-appointed heroes who reveal their groundbreaking treatment that busts open the orthodoxy. Kenny appears to have been a skilled self-promoter. She became famous in the United States and her story even featured in a 1946 Hollywood movie. But some saw her as a tireless propagandist who manipulated, or even falsified, her results. She claimed to have achieved an astounding 80 per cent recovery rate, but this was based on observation and intuition rather than any scientific study. MORE ASK FUZZY: Her approach was based on a fundamental misconception that the problem was a muscular one that could be corrected through "muscle re-education". As some researchers thought at the time and has subsequently been proven, polio paralysis is actually a neurological condition. As someone with direct experience of RSI (Repetitive Strain Injury) and Frozen Shoulder (adhesive capsulitis), I cannot imagine a worse treatment than to stop a person exercising. Treatment today is more nuanced. As with the Kenny method, it includes hot moist packs and physical therapy. However, institutions such as the Mayo Clinic also include appropriate bed rest and even "splints or other devices to encourage good position of the spine and limbs". The Fuzzy Logic Science Show is at 11am Sundays on 2xx 98.3FM. Send your questions to AskFuzzy@ Podcast: In June 1916, New York officially declared a polio epidemic and, in doing so, instigated a practice that we might find unacceptable today. Newspapers published the names and addresses of sufferers, placards were nailed to doors, and families quarantined. Australians too, were affected. Polio became a notifiable disease in Tasmania and other states by 1922. Despite these measures, polio incidents continued to rise until 1938, when in Australia the number of cases peaked at 39 per 100,000. Polio, sometimes called infantile paralysis, is a devastating disease that causes muscle fatigue and spasms in the limbs, often accompanied by severe pain. When Elizabeth Kenny first encountered the disease, the accepted practice was to immobilise the patient. With splints and plaster body casts to prevent muscle tightening, many paralysed patients lay for months at a time. Unfortunately this would often atrophy both affected and healthy muscles. The Australian Elizabeth Kenny (1880 -1952) became something of a maverick by developing what was then considered a radical treatment. In 1913 Kenny opened a small hospital in Queensland, where her method was reportedly used with success. To ease pain, she lay strips of hot moist cloth over the person's affected areas. And rather than immobilising her patients, she had them do exercises such as bending and flexing joints. Several times a day, they'd move them through a limited range of motion. In doing so, she went directly against the orthodoxy, but her methods are now thought to be a forerunner of modern physiotherapy. However Elizabeth Kenny remains a tricky subject. In some ways, she resembles today's self-appointed heroes who reveal their groundbreaking treatment that busts open the orthodoxy. Kenny appears to have been a skilled self-promoter. She became famous in the United States and her story even featured in a 1946 Hollywood movie. But some saw her as a tireless propagandist who manipulated, or even falsified, her results. She claimed to have achieved an astounding 80 per cent recovery rate, but this was based on observation and intuition rather than any scientific study. MORE ASK FUZZY: Her approach was based on a fundamental misconception that the problem was a muscular one that could be corrected through "muscle re-education". As some researchers thought at the time and has subsequently been proven, polio paralysis is actually a neurological condition. As someone with direct experience of RSI (Repetitive Strain Injury) and Frozen Shoulder (adhesive capsulitis), I cannot imagine a worse treatment than to stop a person exercising. Treatment today is more nuanced. As with the Kenny method, it includes hot moist packs and physical therapy. However, institutions such as the Mayo Clinic also include appropriate bed rest and even "splints or other devices to encourage good position of the spine and limbs". The Fuzzy Logic Science Show is at 11am Sundays on 2xx 98.3FM. Send your questions to AskFuzzy@ Podcast: In June 1916, New York officially declared a polio epidemic and, in doing so, instigated a practice that we might find unacceptable today. Newspapers published the names and addresses of sufferers, placards were nailed to doors, and families quarantined. Australians too, were affected. Polio became a notifiable disease in Tasmania and other states by 1922. Despite these measures, polio incidents continued to rise until 1938, when in Australia the number of cases peaked at 39 per 100,000. Polio, sometimes called infantile paralysis, is a devastating disease that causes muscle fatigue and spasms in the limbs, often accompanied by severe pain. When Elizabeth Kenny first encountered the disease, the accepted practice was to immobilise the patient. With splints and plaster body casts to prevent muscle tightening, many paralysed patients lay for months at a time. Unfortunately this would often atrophy both affected and healthy muscles. The Australian Elizabeth Kenny (1880 -1952) became something of a maverick by developing what was then considered a radical treatment. In 1913 Kenny opened a small hospital in Queensland, where her method was reportedly used with success. To ease pain, she lay strips of hot moist cloth over the person's affected areas. And rather than immobilising her patients, she had them do exercises such as bending and flexing joints. Several times a day, they'd move them through a limited range of motion. In doing so, she went directly against the orthodoxy, but her methods are now thought to be a forerunner of modern physiotherapy. However Elizabeth Kenny remains a tricky subject. In some ways, she resembles today's self-appointed heroes who reveal their groundbreaking treatment that busts open the orthodoxy. Kenny appears to have been a skilled self-promoter. She became famous in the United States and her story even featured in a 1946 Hollywood movie. But some saw her as a tireless propagandist who manipulated, or even falsified, her results. She claimed to have achieved an astounding 80 per cent recovery rate, but this was based on observation and intuition rather than any scientific study. MORE ASK FUZZY: Her approach was based on a fundamental misconception that the problem was a muscular one that could be corrected through "muscle re-education". As some researchers thought at the time and has subsequently been proven, polio paralysis is actually a neurological condition. As someone with direct experience of RSI (Repetitive Strain Injury) and Frozen Shoulder (adhesive capsulitis), I cannot imagine a worse treatment than to stop a person exercising. Treatment today is more nuanced. As with the Kenny method, it includes hot moist packs and physical therapy. However, institutions such as the Mayo Clinic also include appropriate bed rest and even "splints or other devices to encourage good position of the spine and limbs". The Fuzzy Logic Science Show is at 11am Sundays on 2xx 98.3FM. Send your questions to AskFuzzy@ Podcast:
AU Financial Review
4 days ago
- AU Financial Review
Cyber thieves are hitting top brands. They don't only want money
The hacking group that pierced the online defences of UK retailer Marks and Spencer has spent months this year laying digital traps designed to trick employees at the world's biggest brands into giving up their passwords. Scattered Spider — which cybersecurity experts describe as a criminal gang of male trash-talking, English-speaking fraudsters — was observed registering websites with nearly identical company names and sharpening their malware tool kits.
