Eli5 What causes motors to overheat when it’s facing more resistances than it can handle?

Question

Eli5 What causes motors to overheat when it’s facing more resistances than it can handle?

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Answer 1

The electrical energy going into the motor must go somewhere. If the motor is functioning normally, most of it becomes kinetic energy. But if the motor unable to rotate due to too much load, the energy cannot become kinetic energy, so it becomes heat instead.