# Calculating Voltage with a diode

Discussion in 'Homework Help' started by wtfman, Oct 7, 2011.

1. ### wtfman Thread Starter New Member

Oct 7, 2011
12
0
Hi im trying to find the voltage for VR1 and VR2 for this circuit but the fact that it is in parallel is throwing me off

D1 is silicon with .7 V

My try for the solution:

VR1 = 10 volts
And VR2= VR1 - .7V

VR2 = 9.3 V

Any help would be greatly appreciated
Thanks

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2. ### jp1390 Member

Aug 22, 2011
45
2
I think you may have forgotten to post the circuit. We can help you once we can see what you are talking about.

JP

3. ### wtfman Thread Starter New Member

Oct 7, 2011
12
0
lol sorry just posted it

4. ### crutschow Expert

Mar 14, 2008
13,475
3,361
It's quite simple. Since the diode voltage drop is 0.7V and the diode is in parallel with R2 the what does the voltage across R2 have to be? (Big hint: All devices in parallel have the same voltage across them).

The voltage across R1 is then 10V minus the voltage across R2.

5. ### wtfman Thread Starter New Member

Oct 7, 2011
12
0
Voltage across R2 is .7 V