Question

3. Look at the given picture and answer the questions asked.
switch
battery
light bulb
wire
a) What would happen if
the negative terminals of both the cells are in contact?
ii) the electric wire is changed with a plastic wire? Give reason.
b) What are the necessary conditions for an electric circuit to work?​

Answer 1

Explanation:

Question 3.

The given figure shows four cells fixed on a board.

Draw lines to indicate how you will connect their terminals with wires to make a battery of four cells.

Physics Class 7 Electric Circuits InCorrect Connections

Answer:

In order to make battery, the positive terminal (+) of one cell should be connected to the (-) terminal of another cell and so on.

Physics Class 7 Electric Currents Battery With Correct Connections

Question 4.

The bulb in the circuit shown in figure does not glow. Can you identify the problem? Make necessary changes in the circuit to make the bulb glow.