the voltage and current in the circuit
the resistance, the current, and the time the circuit operates
the voltage and the resistance of the circuit
the current and the time the circuit operates
2007-07-10 23:53:09 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Option #2: the resistance, the current, and the time the circuit operates
To get kWh, you need to multiply the power being dissipated by the circuit by how long it was operating.
You can get the power using the current and the resistance using the equation P = (I^2)*R where I is current in amps and R is resistance in Ohms. Convert the units to kW by dividing by 1000, then multiply by the number of hours the circuit was in operation.
2007-07-11 02:56:11 · answer #1 · answered by John G 2 · 1⤊ 0⤋
kW-h itself suggests you need Wattage(ie Power) and hour(ie time) . Electrical Power = Electrical Energy/time = voltage * current/time. Current is per unit time. So voltage * current will give you watts. Divide by 1000. You will get kilowatts. Multiply by 3600, you will get kilowatt-hrs. So 1st option (voltage and current) is the required answer.
2007-07-11 07:03:40 · answer #2 · answered by novice 4 · 1⤊ 1⤋
Current and time.
2007-07-14 12:43:30 · answer #3 · answered by johnandeileen2000 7 · 0⤊ 0⤋
All you need is the current(watts) and the time(hours).
2007-07-11 06:57:42 · answer #4 · answered by jsardi56 7 · 1⤊ 0⤋