Question

Observe the following diagram and answer the questions given below:

1. Identify the above diagram.
2. Write the principle on which the above appliance works.
3. Write the working of the above appliance.
4. Write the use of the above appliance.

Answer 1

a. It is a working electric generator.

b. AC generator works on the principle of Faraday's law of electromagnetic induction. The direction of the induced current is found with the help of fleming's right-hand rule.

c. Working:

1. The axle is rotated with help of a machine from outside, the coil ABCD starts rotating.
2. On rotating the axle, branch AB moves upward and branch CD moves downwards hence, coil ABCD rotates clockwise.
3. According to Fleming's right-hand rule, electric current flows in the direction ${\displaystyle \text{A}\to \text{B}\to \text{C}\to \text{D}}$.
   The galvanometer attached shows a deflection. 
4. After half rotation, the branch AB and CD exchange their positions and the induced current flows as ${\displaystyle \text{D}\to \text{C}\to \text{B}\to \text{A}}$.

d. This appliance is majorly used in an electric motor.