Name any two effects of electric current.

3

(a)

When the current is switched ON through a wire, a compass needle kept nearby gets deflected from its North-South position. Explain.

3

(a)

Will the compass needle show deflection, when the switch in the circuit shown by figure is closed?

3

(a)

Name two electric devices for each where
(a) heating effect of current is used and
(b) magnetic effect of current is used.

3

(a)

Why do we cover plug pinholes which are within the reach of children with cellotape or a plastic cover when not in use?

3

(a)

Can we use the same fuse in a geyser and a television set? Explain.

3

(a)

If we connect more cells in the circuit, then what will happen?

3

(a)

If current is passed through a coil, does the pins cling to the coil?

3

(a)

Batteries used in tractors, trucks and inverters are also made from cells. Then why it is called a battery?

3

(a)

What are electric fuses? Write their importance

3

(a)

What are CFLs ? Why are CFLs preferred over electric bulbs ?

3

(a)

How do the electric heater or an electric iron work

3

(a)

State the conclusions of H.S. Oersted from his experiments on the deflection of a compass needle when current was passed through the wires around it.

3

(a)

(i) What is the heating effect of electric current?
(ii) Name two appliances that make use of heating effect of electric current.
(iii) Name the safety device based on the heating effect of electric current.

3

(a)

(a) Draw a circuit diagram to represent a circuit shown in a figure

(b) If the bulb is not glowing in a circuit, what could be two possible reasons for the same

3

(a)