Electronics and Communication Engineering - Analog Electronics - Discussion


In figure The minimum and maximum load currents are

[A]. 0 and 60 mA
[B]. 0 and 120 mA
[C]. 10 mA and 60 mA
[D]. 10 mA and 120 mA

Answer: Option B


When RL = ∞, IL = 0,

When RL = 100 Ω, or 120 mA.

Sandeep said: (Jan 26, 2015)  
What is 25v?

Paul said: (Mar 31, 2015)  
Why doesn't the first 100 ohm resistor add to the series resistance?

Babroo Chavan said: (Apr 14, 2017)  
Why only 12 volt used here.

Then What is 25v?

Reshma said: (Apr 19, 2017)  
Here zener diode is coming parallel to load.

Maharaja said: (May 7, 2017)  
Why particularly use 12v in load current?

Anandu said: (Jul 5, 2017)  
I think since it's an unregulated power supply, 25 V tend to fluctuate.

A Zener diode in reverse config offers no impedance above its breakdown voltage, in this case, 12V.

So a maximum of 12V can be found across that Zener diode which is parallel to RL(thus the same voltage across RL also).

Waseem Haider said: (Sep 10, 2017)  
25v is supply voltges. Zener regulates these volts. 12v zener means it regulates 12volts. So load volt is 12v.

So we use ohms law formula I=V/R.

Wasif said: (Jan 6, 2019)  
What if, the unregulated power supply will be replaced with the regulated power supply?

Sonu Kumar Sahani said: (Jan 17, 2020)  
In ON state, the voltage across load is equal to Zener voltage.

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