Volts to Watts Conversion Formula Calculator and Solved Examples with calculations

Volts to Watts Conversion calculator is a useful tool to perform calculate watts from known volts, provided either of the amps or ohms are known.

Volts to Watts Calculator

Volts to Watts Conversion Formulas

Volts to Watts when Amps are known

Formula: P = VI

where

P = Power in watts

V = Voltage in volts

I = Current in Amps

Example: Find the watts consumed by a circuit when 10 V source connects across it cause 20 mA current to flow through it.

Solution: P = VI = 10 V * (20/1000) A

= 0.2 watts

Volts to Watts When Ohms are known

Formula: P = V²/R

P = Power in watts

V = Voltage in volts

R = Resistance in ohms

Example: Find the power consumed by a 33 ohm circuit when 12 volts are applied across it.

Solution: P = V²/R = (12)²/ 33 ohm = 4.36 watts