DC Electric Power

The electric power in watts associated with a complete electric circuit or a circuit component represents the rate at which energy is converted from the electrical energy of the moving charges to some other form, e.g., heat, mechanical energy, or energy stored in electric fields or magnetic fields. For a resistor in a D C Circuit the power is given by the product of applied voltage and the electric current:

P = VI Power = Voltage x Current

 watts = volts x amperes Enter data in any two of the boxes, then click on the active text for the quantity you wish to calculate.
The details of the units are as follows:

Power in a resistor

AC Power

Example of power in series and parallel circuits