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Q.

A 9 V stabilised voltage supply is required to run a car stereo system from its 12 V battery. Zener diode with VZ = 9 V and Pmax = 0.27 W is used as the voltage regulator in the circuit shown below. If the load resistance is 450 Ω, then find the value of series resistor:

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a

60 Ω

b

150 Ω

c

100 Ω

d

90 Ω

answer is A.

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Detailed Solution

Zener current,

IZ=Pmax Vmax =0.279=0.03 A

Current through RL=9450=0.02 A

Current drawn from the battery,

I=IL+IZ=0.02+0.03=0.05 A

∴  Series resistor,

RS=(V)RSI=30.05=60Ω

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