Explain why the bulb would not glow in the arrangement shown in the figure.

3

(a)

What is the purpose of using an electric switch? Name some electrical gadgets that have switches built into them.

3

(a)

Would the bulb glow after completing the circuit shown in

if instead of safety pin, we use an eraser?

3

(a)

Why should an electrician use rubber gloves while repairing an electric switch at your home? Explain.

3

(a)

The handles of the tools like screwdrivers and pliers used by electricians for repair work usually have plastic or rubber covers on them. Can you explain why?

3

(a)

As we know that silver is the best conductor of electricity instead of this we use copper and aluminium. Why?

3

(a)

Sita is operating an base electric wire so that its electric iron can be used safely. Her friend Vimlesh advised her not to do so without plastic gloves.
(a) Mention the values that Vimlesh shows here.
(b) A plastic glove is an insulator or conductor.

3

(a)

Discuss briefly that how switch works.

3

(a)

When the chemicals in the electric cell are used up, the electric cell stops producing electricity. The electric cell is then replaced with a new one. In case of rechargeable batteries (such) as the type used in mobile phones, cameras and inverters), they are used again and again. How?

3

(a)

Briefly explain about the components present inside the cell.

3

(a)

In which of the following circuits A, B and C given in figure, the cell will be used up very rapidly?

3

(a)

Explain why all the light bulbs and fans go off if the main switch is turned off in your house.

3

(a)

What is a battery? Explain it with a figure.

3

(a)

What type of cells are used in calculators? What are the main advantages of using such type of cells?

3

(a)

How does an electric cell produce electricity?

3

(a)