How may watts does a 60-watt light bulb use in three hours?
Watts are a measure of power. Power is a rate of energy usage. "How many watts used in an hour?", is a nonsensical question.
Sensible questions would be:
-How many kilowatt-hours does a 60 watt bulb use in 3 hours?
-How many joules does a 60 watt bulb use in 3 hours?
Keeping in mind that a watt is 1 joule per second.
How many kilowatt-hours does a 60 watt bulb use in 3 hours?
how can i convert that to amps?
60 watts for 3 hours is 60 * 3 = 180 watt-hours. That's the same as 0.180 kilowatt-hours.
Your next question, "how do I convert that [kilowatt-hours] into amps?" is as non-sensical as the first question.
Amps = unit of current = rate of change of charge.
Volts = unit of electric potential
Joules = unit of energy.
Watt = unit of power = rate of change of energy
Kilowatt-Hours = Non-SI unit of energy
You cannot calculate current from power unless you know the voltage, or the resistance.
ya, i'm confused
Watts and amps are both rates. They both stay constant and do not change with time.
To find the amps, divide by the watts by 120.
Uh... hmm. This is true (as a simplification) in this case, but is not always true.
Not neccessarily. Depends on the country.
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