If you have an electric meter, it shows energy consumed in Watts per hour. This energy has an amount, Joules that is. But in a battery there is energy stored that also has an amount. So it should be in Joules as well. But the unit is different: Ah,(or mAh).Why is that and what is the difference between these two u
In: Physics
W/h is a useless measurement. Your probably thinking of Wh or kWh
Power is energy being consumed per second
Wh is an amount of energy. If you have a 250 W device, run it for 3 hours, it consumes 750 Wh of energy. The power company charges you by the kWh, which is 1000 Wh
Ah, or mAh is a measure of charge, usually for batteries. Amps is a measure of current, which is charge/second, so a device drawing 1 mA for 3 hours consumes 3 mAh from a battery. 1 Ah = 1000 mAh
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