Home
Class 12
PHYSICS
In a Zener regulated power supply a Zene...

In a Zener regulated power supply a Zener diode with `V_(Z) = 6.0` V is used for regulation. The load current is to be 4.0 mA and the unregulated input is 10.0 V. What should be the value of series resistor `R_(S)`?

Text Solution

Verified by Experts

The correct Answer is:
A
Zener current ` I_z ` should be sufficiently larger than load current ` I_L`

Given ` I_L = 4.0 mA `
So. Let us take `I_z `to be five times `I_L ` or `I_Z = 20mA`
Total current `I = I_Z + I_L = 24.0mA `
Input voltage ` V_"in" = 10 V `
Zener diaode voltage ` V_Z = 6V `
`:. ` Voltage drop across resistance , ` V_R = V_"in" - V_Z `
` or `V_R = (10 - 6) V = 4V `
Now , ` R = V_R / I_R = 4 / (24 xx 10^(-3)) = 167 Omega`
The nearest value of carbon resistor is ` 150 Omega ` . So , a series resistor of ` 150 Omega ` is appropriate.
Promotional Banner

Topper's Solved these Questions

  • SEMICONDUCTORS

    DC PANDEY ENGLISH|Exercise Solved Example|14 Videos

  • SEMICONDUCTORS

    DC PANDEY ENGLISH|Exercise Exercise35.1|1 Videos

  • REFRACTION OF LIGHT

    DC PANDEY ENGLISH|Exercise Level 2 Subjective|21 Videos

  • SOLVED PAPER 2017

    DC PANDEY ENGLISH|Exercise Solved papers 2017(JIPMER)|32 Videos

Similar Questions

Explore conceptually related problems

In a zener regulated power supply a zener diode with V_z = 6.0 V is used for regualtion. The load current is to eb 4.0 mA and the unregulated input is 10.0 V . What should be the value of series resistor R?

in a zener diode (dc voltage regulator) circuit with V_("zener")=7.0 V is used for regulation. Thhe load current is to be 4.0 mA and te unregulated input is 11.0 V. what should be te value of series resistor R_(s) if zener diode current is five times te load current

(A) Plot V-I characteristics for an illuminated photo diode under reverse bias for three different illumination intensities I_1 gt I_2 gt I_3 . (B) In a zener regulated power supply, a zener diode with V_2 = 6 V is used for regulation. the load current should be 4.0 mA and zener current is five times the load current for unregulated input of 10 V. Find the series resistor R_3 used in the power supply.

A Zener of power rating 1 W is to be used as a voltage regulator. If Zener has a breakdown of 5V and it has to regulate voltage which fluctuated between 3 V and 7 V, what should be the value of R_(s) for safe operation (see figure) ?

A Zener of power rating 1 W is to be used as a voltage regulator. If Zener has a breakdown of 5V and it has to regulate voltage which fluctuated between 3 V and 7 V, what should be the value of R_(s) for safe operation (see figure) ?

The diode D shown in the circuit is governed by the V-I relation V=(0.7 + 100 I) Volt. The current supplied by the battery is

The diode used in the circuit shown in the figure has a constant voltage drop of 0.5 V at all currents and a maximum power rating fo 100 milliwatts. What should be the value of the resistor R , connected in series with the diode for obtaining maximum current?

In the cuircuit shown here the transistor used has a current gain beta=100 . What should be the bias resistor R_(BE) so that V_(CE)=5V("neglect "V_(BE))

A resistor and a capacitor are connected to an ac supply of 200 V, 50 Hz, in series. The current in the circuit is 2A. If the power consumed in the circuit is 100 W then the resistance in the circuit is

A resistor and a capacitor are connected to an ac supply of 200 V, 50 Hz, in series. The current in the circuit is 2A. If the power consumed in the circuit is 100 W then the resistance in the circuit is