Convert between current (Amps) and electrical power (Watts) using Ohm's Law, including standard NEC circuit breaker sizing.
Calculated Power 1,800 Watts P = 15A × 120V = 1,800W
Recommended Breaker Size (NEC 80% Rule): 20 Amp Breaker
Recommended Wire Gauge: 12 AWG Copper Wire
Standard US Household Circuit Capacities (80% Continuous Rule)
According to the National Electrical Code (NEC), continuous loads operating for 3+ hours should not exceed 80% of a circuit breaker's rated capacity.
| Circuit Breaker | Max Continuous Load | Wire Gauge (AWG) |
|---|---|---|
| 15A (120V) | 1,440 Watts | 14 AWG |
| 20A (120V) | 1,920 Watts | 12 AWG |
| 30A (240V) | 5,760 Watts | 10 AWG |
| 50A (240V) | 9,600 Watts | 6 AWG |