View Single Post
Philip Wood
Feb15-13, 11:04 AM
PF Gold
P: 964
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.