Many 120 V household circuits are rated at 15 A. This means that, if the current

Question

Many 120 V household circuits are rated at 15 A. This means that, if the current in the circuit exceeds this amount, there is a danger of overheated wires causing a fire. Such circuits are protected by circuit breakers that trip or fuses that blow and interrupt the current if it exceeds 15 A. (a) Is it safe to plug a 1400 W space heater into such a circuit? (b) Is it safe to plug two such space heaters into the same circuit, so that the power requirement is 2800 W?

Explanation / Answer

a) Power= 1400 W => Current= 1400/120 A < 15 A => Safe b) if two heaters are connected, the total current =2 *1400/120 > 15A => Not Safe

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