Phone Coil
August 12th, 2009 | 
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I am working on a project trying to create a "shake powered" cell phone charger. Help!?
My partner and I have created a coil and magnet system. We are able to fill our capacitor to 5 volts (the battery is 3.7 v); the coil is attached to a circuit board taken from a shake powered flashlight. When we plug the phone in no charging takes place but the volts all go away. What are we missing? Or doing wrong? We'd appreciate the help!
What is the size of the capacitor?
The amount of charge a cap can store is usually very small compared to that of a good battery, so it's no surprise that the charge on the cap does almost nothing to charge the battery.
Typical cell phone battery is about 5 volts and 3 amp hours. that is 15 watt-hours or 54000 joules.
A 1000 µF 5 volt cap stores E = ½CV² or 0.01 joules.
Even a 1 F 5 volt cap only stores 12 joules, still tiny compared to 54000 J
With the 1 F cap, you would have to repeat the cycle about 4000 times.
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