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Current Electricity

Question

Wired Faculty App

When a current of 5 mA is passed through a galvanometer having a coil of resistance 15Ω, it shows full-scale deflection. The value of the resistance to be put in series with the galvanometer to convert it into to voltmeter of range 0 – 10 V is

2.535 × 10³ Ω

4.005 × 10³ Ω

1.985 × 10³ Ω

2.045 × 10³ Ω

Solution

C.

1.985 × 10³ Ω

10 = (5 × 10^–3) (15 + R)
r = 1985 Ω

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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