Calculate electrical power, voltage, current, and resistance using P = IV and related formulas. Essential for electricians, electronics hobbyists, engineering students, and anyone working with electrical systems.
A power calculator helps you understand the relationship between electrical power, voltage, current, and resistance. Power, measured in watts, represents the rate at which energy is consumed or produced. Whether you're sizing a generator, calculating electricity costs, or designing an electrical circuit, understanding power calculations is essential.
Electrical power is one of the most practical measurements in daily life. Your electricity bill is based on kilowatt-hours (kWh), appliance ratings are in watts, and circuit breakers are sized based on the current (amperes) they can safely handle. This calculator helps you determine any electrical parameter when you know the others, making it invaluable for both DIY projects and professional electrical work.
A 100-watt light bulb connected to a 120V circuit draws I = P/V = 100/120 = 0.833 amperes. Its resistance is R = V²/P = 120²/100 = 144 ohms. Running this bulb for 10 hours consumes 1 kWh of energy.