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Current Electricity

Question

Wired Faculty App

The internal resistance of a primary cell is 42. It generates a current of 0.2 A in an external resistance of 21 n. The rate at which chemical energy to consumed in providing current is

1 J/s

5 J/s

0.42 J/s

0.8 J/s

Solution

A.

1 J/s

Rate energy $\frac{H}{t} = i^{2} R$

(But total Resistance R = 21 + 4 = 25 Ω)

So, $\frac{H}{t} = 0.2 \times 0.2 \times 25$

$\frac{H}{t} = 1 J / s$

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

Answer the following questions:
A steady current flows in a metallic conductor of non-uniform cross-section. Which of these quantities is constant along the conductor: current, current density, electric field, drift speed?

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