Calculate electrical power, voltage, current, and resistance for DC circuits.
Circuit Parameters
Calculation Results
Enter two parameters to calculate power
About this calculator
Quick Reference
PPower in Watts (W)
VPotential in Volts (V)
ICurrent in Amperes (A)
RResistance in Ohms (Ω)
Overview
In electrical circuits, power is the rate at which electrical energy is transferred. In a DC circuit, it is calculated using combinations of voltage, current, and resistance.
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Pro Tips
P = V × I (Watt's Law).
P = I² × R (Power in terms of resistance).
P = V² / R (Power in terms of voltage and resistance).
1 Watt = 1 Joule per second.
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Fun Facts
"Small appliances like a toaster can use 1000-1500 Watts."
"The term 'Watt' is named after James Watt, but the unit for power was only adopted internationally in 1882."
"Transmission lines use high voltage to minimize power loss ($P=I^2R$) by keeping the current low."
