Reddit reviews Shake Flashlight Magnetic Induction Bright LED Rechargeable Flash Light
We found 10 Reddit comments about Shake Flashlight Magnetic Induction Bright LED Rechargeable Flash Light. Here are the top ones, ranked by their Reddit score.
Super bright blue/white LED bulbSimply shake to recharge flashlightPowered by principles of Faraday's Principle of InductionNever needs batteries, never needs bulbs, maintenance freeSave money - never have to buy batteries
Class C Wankware offense You are guilty of the following crimes:
Explanation: Shake charging flashlights have been around for ages. Making a shakable radio isn't really that new/"innovative".
Explanation: The designer claims that this pen will "attract more students toward their studies" because it will entertain them while they work. In reality, this pen will be more difficult to wield than a typical pen and will be much more detrimental if lost or broken. Also, and this is a moot point, who listens to the radio anymore?
Explanation: Just because something moves doesn't mean you should try to draw energy from it. Because this device draws energy from your hand, it will be more difficult to write with and cause fatigue earlier. A simple AAA battery will provide hours and hours of use, decrease the cost of the pen, and not seriously alter the writing experience. At that point though, it would make more sense just to use a more conventional radio that plugs into the wall.
Explanation: Though I don't know exactly how the generator on this pen is supposed to operate, I'm guessing that unless it makes it seriously difficult to write (drawing a lot of energy from your hand), it will not be able to generate that much energy from writing. As such, it will either require a lot of pre-shaking to operate or it will remain very very quiet. Again, a battery makes more sense.
You will be contacted to schedule a court date.
Actually, I think it's supposed to be one of these
Like the flashlight that is powered by ? Horrible reviews though
This was the only "shake to charge" flashlight i found. Doesn't have good reviews though
No batteries...
http://www.amazon.com/Shake-Flashlight-Batteries-Simply-Recharge/dp/B000637LTY
Time obviously shortened in the game to not bore you, but that's what you're doing.
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Truth in Television, I suppose.
There are apparently flashlights IRL that work this way. You shake them to build up charge and get like 10 or so minutes of light. Sounds perfect for emergencies and disasters, since it requires no batteries to operate.
It is totally possible (watches with gravity-powered generators are widely available). I think the question would be whether it produced enough energy to justify the cost and added weight.
If you've ever used a flashlight powered by "shaking" you'd know what I mean (they have an extremely low light output vs. the amount of shaking needed).
I'm not sure about the wattage considerations but I assume it would be complicated to transfer such a wide range of power to the battery.
It has very low efficiency and torque, you wouldn't be able to charge much with that miniature thing.
You're better off with a more efficient device, such as.. let's say a bike dynamo and a bike wheel.... and you spin the wheel manually for a about 3-5 minutes to charge a phone enough to make a call.
Or you could build yourself a supersized charger based on the magnetic induction, the kind of system used in these flashlights with no batteries: http://www.amazon.com/Shake-Flashlight-Batteries-Simply-Recharge/dp/B000637LTY
You just need some insulated copper wire, some permanent magnets, a voltage regulator and a few super capacitors or a car battery to store the charge. Then use it like you would use a bike pump for example, to generate power.