Answer to Question #272303 in Electric Circuits for ali

Question #272303

A 9v stabilized voltage supply is required to run a car stereo system from car 12 v battery.A zener diode with Vz = 9v and Pmax. = 0.25 W is ued as a voltage regulator as shown in figure .find the value of the series resistor.

1
Expert's answer
2021-11-29T11:47:38-0500

Solution;

The figure is as below;


R can be calculated using the equation;

Vs=IzmaxR+VzV_s=I_{z_{max}}R+V_z

But;

Pmax=IzmaxVzP_{max}=I_{z_{max}}V_z

Hence;

Izmax=PmaxVz=0.259=0.0278AI_{z_max}=\frac{P_max}{V_z}=\frac{0.25}{9}=0.0278A

By direct substitution;

12=0.0278R+912=0.0278R+9

0.0278R=129=30.0278R=12-9=3

R=30.0278=108ΩR=\frac{3}{0.0278}=108\Omega




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Comments

Alee
30.11.21, 03:52

Thanks a lot sir

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