Question 6.
Which device is used to produce electricity? Describe with a neat diagram.
a. Electric motor
b. Galvanometer
c. Electric Generator (DC)
d. Voltmeter
Answer:
C
It converts mechanical energy into electrical energy
It consists of armature coil ABCD which is placed between two poles of a horse-shoe shaped electromagnet, two split rings S1 and S2 connected to two brushes B1 and B2 respectively.
When the coil is rotated the magnetic lines changes thus induces a current in the coil. The direction of induced current in the arms of coil reverses after every half rotation which can be obtained by Fleming’s right-hand rule. Here one brush is always in contact with the arm moving up in the field and another brush is in contact with the arm moving downward. So, a unidirectional current flows in the circuit.
