Current Power Calculator Guide
The Power Triangle
Understanding the relationship between Watts, Volts, and Amps is the foundation of all electrical work.
Watt's Law
Power (Watts) = Voltage (Volts) × Current (Amps)
P = V × I
If you know any two values, you can calculate the third.
Real World Examples
Circuit Breakers
Why does my breaker trip?
- Scenario: A 15-Amp breaker at 120 Volts can handle 1,800 Watts (15 × 120).
- Overload: If you plug in a 1,500W heater and a 1,000W hair dryer (Total 2,500W), the breaker trips.
Generators
Sizing a generator.
- Calculation: Add up the wattage of all appliances you want to run (Fridge + Lights + AC).
- Surge: Motors (AC/Fridge) need 3x the power to START than to RUN. Account for this surge.