WireWhy

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Wired it wrong? WireWhy is a free electrical wiring simulator in your browser. Wire breakers, GFCIs, switches, outlets, relays and motors like a real installation, then switch it on or break something. It calculates the current in every wire and shows you why the breaker tripped or the light stayed dark, and the path the fault current took. Measure like an electrician, practise on exercises that check your circuit, or build your own for a class. 120/240 V or 230/400 V. No account needed.

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