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Current Electricity

Question

Wired Faculty App

The reading of the ammeter for a silicon diode in the given circuit is

13.5 mA

0 mA

15 mA

11.5 mA

Solution

D.

11.5 mA

Clearly, from fig. given in the question, Silicon diode is in forward bias.

therefore,
The potential barrier across the diode
ΔV = 0.7 volts

Current, $I = \frac{V - ∆ V}{R} = \frac{3 - 0.7}{200} = \frac{2.3}{200} = 11.5 m A$

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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Mock Test Series

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