Generator Power Is Voltage Times Current - Magnetism, Induction, and Transmission Lines Step by Step

A generator power ledger turns the induced voltage and delivered current into the electrical power available to the load. The 4 V, 3 A, and 12 W arithmetic is exact only for the declared ideal output values and steady load; real generators have winding resistance, magnetic saturation, changing speed, friction, heating, switching or brush losses, waveform shape, and voltage/current measurement uncertainty.

Generated voltage and load current produce an exact power ledger. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

Generated voltage and current make power

Generated voltage 4 volts and current 3 amperes make power 12 watts.

P=4\times3=12\ \mathrm{W}

Power over time gives generated energy

Over 5 seconds, power 12 watts gives energy 60 joules.

E=12\times5=60\ \mathrm{J}