What happens when we give ac supply to a dc motor?

Read the full article on Can DC Motor run on AC supply and Vice-Versa? Full Explanation

A DC series motor is capable of running when supplied with a single phase AC supply. This is because the torque, which varies as the product of the armature and field current, is always positive.Thus, a positive average torque causes the motor to rotate.

https://www.quora.com/What-would-happen-if-a-DC-motor-was-supplied-with-AC-and-vice-versa