Question

Complete the following sentences about the methods and physical principles of generating electricity.

In principle, we can generate an electric current by moving a coil of wire back and forth near…………….. . However, in a practical electric generator, we supply mechanical energy by rotating a coil. Using moving contacts, we can connect the ends of the coil to an external wire to complete the circuit. A Current then flows through the circuit. The mechanical energy we supply to the generator is………………… .

1. a semiconductor slab
2. Two panels with opposite charges
3. A bar magnet

1. Lost as heat in the wire
2. Returned to the original source
3. Stored in the wire

Answer 1

In principle, we can generate an electric current by moving a coil of wire back and forth near **a bar magnet**. However, in a practical electric generator, we supply mechanical energy by rotating a coil. Using moving contacts, we can connect the ends of the coil to an external wire to complete the circuit. A current then flows through the circuit. The mechanical energy we supply to the generator is **returned to the original source**.

(Note: The given options for the second part of the sentence do not precisely match the context of generating electricity using a coil and a bar magnet.)