Q30 of 71 Page 418

Find the equivalent resistance of the network shown in figure between the points A and B.



Case 1: Potential at terminal A > Potential at terminal B
The diode will be forward biased and it can be replaced by short circuit.


Net resistance = = 10/2 = 5Ω



Case 2: Potential at terminal A < Potential at terminal B
The diode will be reverse biased and it can be replaced by open circuit.


Net resistance=10Ω


More from this chapter

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28

Find the current through the resistance R in figure if (a) R = 12 Ω (b) R = 48 Ω


 29

Draw the current voltage characteristics for the device shown in figure between the terminals A and B.



 31

When the base current in a transistor is changed from 30 μA to 80 μA, the collector current is changed from 1.0 mA to 3.5 mA. Find the current gain β.

 32

A load resistor of 2 kΩ is connected in the collector branch of an amplifier circuit using a transistor in common-emitter mode. The current gain β = 50. The input resistance of the transistor is 0.50 kΩ. If the input current is changed by 50 μA,

(a) by what amount does the output voltage change,


(b) by what amount does the input voltage change and


(c) what is the power gain?