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Why are motors apt to "burn out" when switched-on if they are jammed (unable to spin...

Why are motors apt to "burn out" when switched-on if they are jammed (unable to spin quickly)?

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Answer #1

when motor is jammed, the rotor cannot move so coil does not rotate. hence coil is not cutting magnetic field lines of magnet.

Due to this there will be zero back emf in motor. now due to zero back emf, current will increase as the only opposing factor to rise in current is resistance of coil which is very less so current shoots up which generate lot of heat in coil and also insulation also melts which result in short circuit in coil which generate even more heat and due to which coil of motor burn out.

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