What will technically happen if AC current enters an electrical appliance which uses DC current?

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Solution

If AC is supplied to a circuit that has to run on DC then the DC equipment is likely to fail and burn.

If DC is supplied to an AC motor (not a rectified DC motor) then it's bad news again and, if the current that can be taken from the DC source is large enough, the motor will likely burn its windings and go open circuit.

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