The Electrical Power calculator computes the power based on Ohm's Law using electrical resistance (R) and current (I).
INSTRUCTIONS: Choose units and enter the following:
Electrical Power (P): The calculator returns the electrical power in watts. However, this can be automatically converted to other power units via the pull-down menu.
P = R • I²
Power is most commonly measured in watts (W). One watt is equal to one joule per second (1 W = 1 J / 1 s). Power is also measured in horsepower (hp) where 1 horsepower equals 745.7 watts. Power is also measured in heat energy transfer as BTUs per hour (BTU/h).
The Ohm's Law calculator suite computes power (watts), potential (voltage), current (amps) and resistance (ohms) in relation to each other based on Ohm's Law. There is a fundamental relationship between electrical parameters: potential, current, resistance and power depicted in the graphical wheel (see wheel).
The Ohm's Law Calculator suite has automatic unit conversions for the input and output of the equations. The equations are as follows. Click on the formula for a pop-up calculator with the formula, or click on the description link for the page dedicated to that formula.
watts, milliwatts, kilowatts
ohms, milliohms, kiloohms
amps, milliamps, microamps, gilberts