# Calculate the value of v0 for the given circuit for i) vi = 5V, ii)vi = 10V and iii) vi = 15V

#### studyhard24

Joined Jun 20, 2022
32

#### ericgibbs

Joined Jan 29, 2010
15,699
hi 24,
Welcome to AAC.
As this is homework you must post your best attempt at answering, we can the help.
E

#### studyhard24

Joined Jun 20, 2022
32
For Zener diode Vz = 10V
i) vi = 5v < Vz so no flow v0 =0V
ii)vi = 10v which is equal Vz so no flow v0 =0V
vi = 15v > Vz sothere will be flow of current. But I'm unable to calculate how.

this is as much as I know

#### crutschow

Joined Mar 14, 2008
30,103
vi = 15v > Vz sothere will be flow of current. But I'm unable to calculate how.
So there is a 15V source and the Zener has 10V across it.
Then how much voltage is across the resistor?

#### studyhard24

Joined Jun 20, 2022
32
So there is a 15V source and the Zener has 10V across it.
Then how much voltage is across the resistor?
15-10 = 5V.

#### studyhard24

Joined Jun 20, 2022
32
There is nothing to do with the 100 Ohm in the circuit since it's parallel to the the Vo

#### crutschow

Joined Mar 14, 2008
30,103
15-10 = 5V.
That is correct.
There is nothing to do with the 100 Ohm in the circuit since it's parallel to the the Vo
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I don't understand that as it makes no sense.
Vo is just the voltage across the resistor.
Why do you think the resistor being "parallel to the Vo", whatever that means, is some sort of problem?