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Old 19th November 2004, 09:07 AM   #1
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Default Electromaget produces light...

"In place of a bulb, an electromagnet produces light; in place of a battery, a capacitor stores the power,"

I read this at the site

anybody explain please?

Gajanan Phadte
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Old 19th November 2004, 09:23 AM   #2
UrSv is offline UrSv  Sweden
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What's there to explain? The thing uses an LED as a light source instead of a bulb and there is no battery but a capacitor which is charged by a moving magnet which induces a voltage in a coil when you shake the flashlight.
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Old 19th November 2004, 09:30 AM   #3
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Quote:
In place of a bulb, an electromagnet produces light
If I am not wrong, I think there is no LED either

Gajanan Phadte
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Old 19th November 2004, 09:56 AM   #4
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Talking Re: Electromaget produces light.../IQ

Quote:
Originally posted by gmphadte
"In place of a bulb, an electromagnet produces light; in place of a battery, a capacitor stores the power,"

I read this at the site

anybody explain please?

Gajanan Phadte
Hi,
I did the IQ test on that site and answered all questions at random. Guess what my IQ was rated 91........
Do I need to say more?

Edit quote from the site:
Quote:
Your IQ score is 91
This number is based on a scientific formula that compares how many questions you answered correctly on the Classic IQ Test relative to others.
Your Intellectual Type is Precision Processor. This means you're exceptionally good at discovering quick solutions to problems, especially ones that involve math or logic. You're also resourceful and able to think on your feet. And that's just some of what we know about you from your test results.
I feel so flattered. Also the suggestion to start a study at the university is enlighting as I already have an academic degree.
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Old 19th November 2004, 09:57 AM   #5
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Default There is a Led

I have seen and played with such a torch light.
There is a Led inside.

UrSV is right on how the energy is produced ans stored.

grtz

Simon
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Old 19th November 2004, 10:12 AM   #6
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Transfered epithet (something like that) at wrong place at that site

Funny english
t o becomes...
g o becomes...

Rest all is piece of cake
Thanks all

Gajanan Phadte
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Old 19th November 2004, 10:18 AM   #7
muhy3 is offline muhy3  Australia
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Simply put this little torch uses a wire-wound coil and a fairly strong magnet, similarly to a solenoid only instead of charging the coil with another current source, the in/out motion of the magnet through the center of the coil induces a current which is then transmitted to a capacitor. Then this energy is used to light a low power led.

There is no way a magnet could produce light and it is somewhat misleading to the unknowing for the company to say that the "bulb" has been replaced by the electromagnet. That's kinda like saying "we replaced the batter with a light", really absurd.
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Old 19th November 2004, 10:36 AM   #8
Prune is offline Prune  Canada
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Let's see now...
Google search: NightStar
Second result: http://www.nightstar1.com/
Second sentence: Once charged, NightStar provides light for up to 20 minutes from the LED.
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Old 19th November 2004, 12:15 PM   #9
UrSv is offline UrSv  Sweden
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Quote:
Originally posted by gmphadte


If I am not wrong, I think there is no LED either

Gajanan Phadte
As stated by the others and looking at the pictures from the "more info" link on that site I think there is little doubt that there is indeed an LED:

Click the image to open in full size.
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Old 19th November 2004, 01:33 PM   #10
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Quote:
Originally posted by muhy3

There is no way a magnet could produce light
Not strictly true, since light is an electromagnetic wave it stands to reason that spinning a magnet would produce alternating north and south fields, and since a moving magnetic field produces a moving electric field and vice-versa, you immediately have the EM field. This would produce a horizontal pattern of exactly one frequency, but unfortunately, it is notoriously difficult to spin anything at 24P RPM (that's peta-, 10^15, one k up from tera). (For why this happens, imagine the magnetic field produced by the magnet, then imagine it being twisted as it rotates. It 'expands' out from the magnet with light speed, so it has to be spun *very* fast to get such narrow wavelengths.)

Tim
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