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Suppose this experiment is carried out using only one cell but wires of same length & thickness but made of different materials like nichrome wire, fuse wire, copper wire and iron wire which are replaced one by one. Out of V and I which will change and why?
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(A) The plug key was removed to prevent overheating of circuit components /to avoid accidental burns / to stop the battery from draining. (any one) (1 Mark)
(B)
$\bullet$ Voltmeter reading increases. ($\frac{1}{2}$ Mark)
$\bullet$ because larger potential difference is applied. ($\frac{1}{2}$ Mark)
(C)
$\bullet$ When all four cells were connected in series in the circuit. (1 Mark)
$\bullet$ Current is directly proportional to potential difference applied. (1 Mark)
OR
$\bullet$ I or current will change. (1 Mark)
$\bullet$ Wires made of different material have different resistance. (1 Mark)
(B)
$\bullet$ Voltmeter reading increases. ($\frac{1}{2}$ Mark)
$\bullet$ because larger potential difference is applied. ($\frac{1}{2}$ Mark)
(C)
$\bullet$ When all four cells were connected in series in the circuit. (1 Mark)
$\bullet$ Current is directly proportional to potential difference applied. (1 Mark)
OR
$\bullet$ I or current will change. (1 Mark)
$\bullet$ Wires made of different material have different resistance. (1 Mark)