Question

In an experiment to study the relationship between potential difference and current through a
resistor, a student recorded the following observations.
2
3
Potential difference (V)
4.5
5
6
0.08
0.12
Current (A)
0.15
0.20
0.24
a) Which set of values is incorrect? Give reason.
b) Find the mean value of the resistance from the given table.​

Answer 1

Explanation:

First plot the graph of V Vs. I using the data. You will see that the reading (0.15 A, 4.5V) is different from others. So omit this data. The mean value of the resistance is given by the slope of the V-I curve. It can be calculated as R = ΔV/ΔI = (5−3) V/(0.20− 0.12)A = 25 Ω.