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Experimental set-up
- 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.
- 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 figure.
- 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.]
- Replace the nichrome wire with the torch bulb in the circuit and find the current through it by measuring the reading of the ammeter.
- Now repeat the above step with the \(10\ W\) bulb in the gap \(XY\).
Are the ammeter readings differ for different components connected in the gap \(XY\)?
What do the above observations indicate?
It is observed that the current value is for different electrical components. Some of the components offer a path for the while the others .
You may repeat this activity by keeping any material component in the gap. Observe the ammeter readings in each case. Analyse the observations.
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