Question

An electric circuit consisting of a 0.5 m long nichrome wire XY, an ammeter, a voltmeter, four cells of 1.5 V each and a plug key was set up.
(i) Draw the electric circuit diagram to study the relation between the potential difference maintained between the points 'X' and 'Y' and the electric current flowing through XY.
(ii) Following graph was plotted between Y andl values using above circuit:

What would be the values of V/I ratios when the potential difference is 0.8 V, 1.2 V and 1.6 V respectively? What conclusion do you draw from these values?

Answer 1

(i)

(ii)

\(R = \frac VI\)

at \(V = 0.8 V\)

\(R = \frac{0.8}{0.3} = 2.67\) ohm

at \(V = 1.2 V\)

\(R = \frac{1.2}{0.45} = 2.67 \) ohm

at \(V = 1.6 V\)

\(R = \frac{1.6}{0.6} = 2.67\) ohm

Answer 2

(ii) Following graph was plotted between V and l values.

Conclusion: If 1be the current through XY resistor and V be the potential difference across