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Current Electricity

Question

Wired Faculty App

In the given figure, potential difference between A and B is

0 V

5 V

10 V

15 V

Solution

C.

10 V

Equivalent resistance, R = 10 + $\frac{10}{2}$

= 15 Ω

∴ Current I = $\frac{V}{R}$

= $\frac{30}{15 \times 10^{3}}$

= 2 × 10^-3 A

Hence potential difference between A and B,

V = $(\frac{2 \times 10^{- 3}}{2})$ × 10 × 10³

V = 10 V

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?

Answer the following questions:
Is Ohm’s law universally applicable for all conducting elements? If not, give examples of elements which do not obey Ohm’s law.

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