Zubeda made an electric circuit using a cell holder shown in Fig. 14.4, a switch, and a bulb. When she put the switch in the ‘ON’ position, the bulb did not glow. Help Zubeda in identifying the possible defects in the circuit.
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Given:

Zubeda made an electric circuit using a cell holder shown in Fig. 14.4, a switch, and a bulb. When she put the switch in the ‘ON’ position, the bulb did not glow.

To do:

To identify the possible defects in the circuit.

Solution:

Observation of the given circuit:

On observing the given circuit it is found that:

• It is a combination of two electric cells.
• The positive terminal of an electric cell seems connected to the negative terminal of another cell.
• Both electric cells are tied together with the help of a rubber band.

When the switch is in the ‘ON’ position

When Zubeda put the switch in the ‘ON’ position, the bulb did not glow.

Possible reasons:

Below listed reasons are possible for the situation if the bulb does not glow:

1. It may be that the rubber band is not tight so that the two cells can connect properly. If the cells will not be in proper contact, the bulb will not glow.
2. The bulb may be fused
3. Chemicals inside the electric cells may be finished.