The correct answer is: B. Prime mover
A prime mover is a device that converts energy from one form to another to produce mechanical power. The most common type of prime mover is a steam turbine, which uses the heat energy from burning fuel to turn a turbine. Other types of prime movers include internal combustion engines, electric motors, and waterwheels.
A DC generator is a device that converts mechanical energy into electrical energy. It does this by using a rotating magnetic field to induce an electric current in a coil of wire. The current produced by a DC generator is direct current, which means that it flows in one direction only.
A DC generator can be considered a prime mover because it converts mechanical energy into electrical energy. This electrical energy can then be used to power other devices, such as motors, lights, and computers.
The other options are incorrect because:
- A rectifier is a device that converts alternating current (AC) to direct current (DC).
- A rotating amplifier is a device that amplifies electrical signals by rotating a magnetic field.
- A power pump is a device that uses mechanical energy to move fluids.