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Current Electricity

Question
CBSEENPH12039907
Wired Faculty App

The internal resistance of a 2.1 V cell which gives a current of 0.2 A through of 0.2A through a resistance of 10Ω is 

  • 0.2Ω

  • 0.5Ω

  • 0.8Ω

  • 1.0Ω

Solution

B.

0.5Ω

As,
fraction numerator straight E over denominator straight R plus straight r end fraction space Or space straight E space equals straight I space left parenthesis straight R plus straight r right parenthesis 2.1 space equals space 0.2 space left parenthesis 10 plus straight r right parenthesis 10 plus space straight r space equals space fraction numerator 2.1 over denominator 2 end fraction space straight x 10 straight r equals space 10.5 minus 10 space equals space 0.5 straight capital omega

Some More Questions From Current Electricity Chapter

What conclusion can you draw from the following observations on a resistor made of alloy manganin?

Current A

Voltage V

Current A

Voltage V

0.2

0.4

0.6

0.8

1.0

2.0

3.94

7.87

11.8

15.7

19.7

39.4

3.0

4.0

5.0

6.0

7.0

8.0

59.2

78.8

98.6

118.5

138.2

158.0

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