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Philip Wood
#5
Feb15-13, 11:04 AM
PF Gold
P: 939
A short-circuit means a circuit which is too short - usually unintentionally. Its resistance is so low that it takes too large a current, overloading the power source and/or overheating the wires.

As cjl pointed out, the wire of the electromagnet is chosen to be long enough and thin enough for its resistance to be large enough for only a modest current to flow.