For electric motors, you push power through the motor to make it turn, but the power you out in doesn’t equal the power that comes out. This happens because it takes a bit of power to push the rest of the power through the copper.
Where does this power loss go? Most of it becomes heat. So what happens when you stop the motor from turning all together? You’re still pushing power through the motor, but none of it is coming out. So all of it is turned into heat.
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