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Lighting an electric bulb:
1. Take four lengths of electric wire with differently coloured plastic coverings.
2. Remove a little of the plastic covering from each length of wire at the ends.
3. This would expose the metal wires at the ends of each length.
4. Fix the exposed parts of two wires to the cell and the other two of the bulb as shown in the figures.
A cell with two wires
A small bulb with two wires
5. You can stick the wires to the bulb with the tape used by electricians.
6. Use rubber bands or tape to fix the wires to the cell.
7. Now, connect the wires fixed to the bulb with those attached to the cell in six different ways as shown in the figure below.
6. Use rubber bands or tape to fix the wires to the cell.
7. Now, connect the wires fixed to the bulb with those attached to the cell in six different ways as shown in the figure below.
For each arrangement, find out whether the bulb glows or not. Write 'Yes' or 'No' for each arrangement in your notebook.
Now, carefully look at the arrangements in which the bulb glows. Compare these with those in which the bulb does not glow. Can you find the reason for the difference?
The bulb glows only for the circuit arrangement in which the .
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