Home — Electronics — Power Calculator (Watts)
\u{1F4A1} Power Calculator (Watts)
Calculate electrical power using P = V x I, P = I²R, or P = V²/R. Solve for power, voltage, current, or resistance.
Enter any two known values to solve for the others.
Understanding Electrical Power
Electrical power is the rate of energy transfer in a circuit, measured in watts (W). The three fundamental power formulas are: P = V × I (power equals voltage times current), P = I² × R (power equals current squared times resistance), and P = V² / R (power equals voltage squared divided by resistance).
These formulas are essential for sizing power supplies, selecting fuses, and ensuring components can handle the power dissipation in your circuit. Always provide adequate derating — components should be rated for at least 50% more than the calculated power.
AD PLACEMENT — IN-CONTENT (728×90)
AD — SIDEBAR (300×600)