Question

n Take a nichrome wire, a torch bulb, a 10 W bulb and an ammeter (0 – 5 A range), a plug
key and some connecting wires.
n Set up the circuit by connecting four dry cells of 1.5 V each in series with the ammeter
leaving a gap XY in the circuit, as shown in Fig. 12.4.
Figure 12.4
n Complete the circuit by connecting the nichrome wire in the gap XY. Plug the key. Note
down the ammeter reading. Take out the key from the plug. [Note: Always take out the key
from the plug after measuring the current through the circuit.]
n Replace the nichrome wire with the torch bulb in the circuit and find the current through it by
measuring the reading of the ammeter.
n Now repeat the above step with the 10 W bulb in the gap XY.
n Are the ammeter readings different for different components connected in the gap XY?
What do the above observations indicate?
n You may repeat this Activity by keeping any material component in the gap. Observe the
ammeter readings in each case. Analyse the observations.

Answer 1

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