i found out somthing :P GC related

[techknott]

When u buy ur electricity, you don't pay for the voltage, u pay for how much you use, ie wattage or ampage.

Wattage, not amperage, in kWh (kilowatt-hours). Usually 10 cents or so per kWh.

Voltage X Current hours = Watt-Hours
12V X 60Ah = 720 Wh (or .72 kWh)
(12v@1Amp for 1hr)

Nitpicking, no difference!!!