1.
Loudspeaker, microphone, electric motor, bar magnet.
Ans. Bar Magnet: - It is a magnet while
the rest are devices working on electromagnetism.
2.
Armature coil, brushes, commutator, direct current.
Ans. Direct current:
- The rest are parts of a generator.
3.
Fuse, insulating material, rubber shoes, generator.
Ans. Generator: - The rest are safety
measures in using electricity.
4.
Voltmeter, ammeter, galvanometer, thermometer.
Ans. Thermometer:
- The rest are dives working on electromagnetism.
