DC Circuit Power Calculator
Voltage is energy per unit charge. Current is the rate of electric charges moving through a conductor. Electrical power is the product of voltage and current.
Calculate Power from Voltage & Current (P = V * I)
Inputs
Voltage
Current
Output
Power
Calculate Voltage from Power & Current (V = P / I)
Inputs
Power
Current
Output
Voltage
Calculate Current from Power & Voltage (I = P / V)
Inputs
Power
Voltage
Output
Current
Calculate Power Dissipated in a Resistor (P = I2 * R)
Inputs
Current
Resistance
Output
Power
$$P = V X I. $$
Here P is power in watts. V is voltage in volts. I is current in amps.
Equations
The equation can be rearranged using algebra.
$$P = V X I$$
$$V = P / I$$
$$I = P / V$$
Application
This tool allows you to easily calculate power if you know current and voltage.
