# 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.