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Interactive Explainer

Why A Breaker Trips

Tap the things running on one circuit. A meter adds up the amps and shows the moment the load passes what the breaker allows.

Plug things into one circuit and watch the load climb.

  • Nine common household loads with typical label wattage
  • Switch between a 15 amp and a 20 amp breaker
  • Marks the 80 percent line for loads that run for hours

How It Works

Amps are watts divided by volts, and a home circuit is 120 volts. A 1,500 watt space heater draws 12.5 amps by itself. Add a 1,000 watt microwave and the total is 20.8 amps, more than a 15 amp breaker allows, so it trips.

How A Business Would Use It

An electrician can put this on the page about tripping breakers. A homeowner learns why the heater and the microwave cannot share a circuit, and why the fix is a new circuit and not a bigger breaker.

Who it fits. Electricians who answer the same question on every service call.

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