I took an old bike and a treadmill motor, some old wood and nails and now I have a homemade generator.

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This people powered generator produced about 300 watts of power. So if you pedal for one hour you will have 300 Watt Hours of usable energy.

You could run a 1 watt LED light bulb for 300 hours. Or you could run a 100 watt incandescent light bulb for 3 hours. You could run a laptop for about 5 to 6 hours.

Of course this all depends on your batteries and wires. And you must account for any losses in the system.

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