Final answer:
Yes, it generally takes the mechanical energy of a prime mover and turns it into electrical power. An electric motor, however, converts electrical energy to mechanical energy and simple machines are always less than 100% efficient due to friction.
Step-by-step explanation:
The conversion of one form of energy to another by a prime mover, such as a generator or engine, typically does involve the transformation of mechanical energy into electrical power. This is true because devices like steam turbines in power plants convert the thermal energy of steam into mechanical energy, which then drives a generator to produce electricity. In the case of an electric motor, however, the correct answer to the quiz question is 'a. An electric motor transforms electrical energy into mechanical energy.' As for the efficiency of simple machines, it is true that they are always less than 100 percent efficient, as some of the input work is invariably lost to heat due to friction. Additionally, when a bar magnet is dropped through a copper tube, it indeed induces an electric current in the tube, making the statement true.