How to Calculate Power (Watts, Amps, Volts)
Quickly find the wattage, amperage, or voltage of a circuit to ensure safety and equipment compatibility.
Whether you're installing a new light fixture or sizing a portable generator, understanding the relationship between Volts, Amps, and Watts is essential for electrical safety.
The Ohm's Law Equation (simplified)
Watts = Volts x Amps. If you know two of these values, you can instantly find the third. Most appliances have a label indicating their power draw in Watts or Amps.
Safety Margin
Never run a circuit at its maximum rated capacity for an extended period. A 20A circuit should only draw about 16A (80% load) continuously. Overloading can lead to heat buildup and circuit breaker trips.
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