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Electricity — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceElectricity3 Marks
Question
In an experiment to study the relation between the potential difference across a resistor and the current through it, a student recorded the following observations:

  
Potential Difference V(volts)
Current I(amperes)
1.0
0.1
2.2
0.2
3.0
0.6
4.0
0.4
6.4
0.6

On examine the above observations, the teacher asked the student to reject one set of readings as the values were out of agreement with the rest. Which one of the above sets of

readings can be rejected? Calculate the mean value of resistance of the resistor based on the remaining four sets of readings.

✓

Answer

For 1st potential difference and current

v=IR

1 = 0.1 × R

$\frac{1}{0.1} = \text{R}$

R = 10

for 2nd set of observation

v=IR

2.2 = 0.2 × R

$\frac{2.2}{0.2} =\text{R}$

R = 11

for 3rd set of observation

v= IR

3 = 0.6 × R

$\frac{3}{0.6} = \text{R}$

R = 5

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