# Voltage divider

#### sebholm

Joined Dec 18, 2020
20

Is this correct?

#### ericgibbs

Joined Jan 29, 2010
18,662
hi seb,
To check why not assign values to R2,R3 & R4||R5
Let V=9v R2 =3 , R3=3 and R4 & R5 =6 ohms each.
What Vout do you get.?
E

#### sebholm

Joined Dec 18, 2020
20
3.375=v5?

#### ericgibbs

Joined Jan 29, 2010
18,662
hi,
No,
What value is R4 and R5 in parallel, if they are both 6 ohms.?
E

#### sebholm

Joined Dec 18, 2020
20
3ohm is R4 and R5.
It´s 3 volt over v5.
Thought r2 was 2ohm.

#### ericgibbs

Joined Jan 29, 2010
18,662
hi,
Let R2 = 3 ohms , R3 = 3 ohms,.
If R4 = 6 and R5 =6, in parallel thats 3 ohms.
So you have a circuit with 3 resistors of 3 ohms in series., with a 9V supply.
What voltage must be across each 3 ohms.??

E

#### sebholm

Joined Dec 18, 2020
20
3V

#### Doros

Joined Dec 17, 2013
144
R1 doesn't play any role in the V5 voltage calculation
R4 & R5 combined are a 3 ohm resistor, so as a voltage divider the V5 is 1/3 of the 9V meaning 3V

#### ericgibbs

Joined Jan 29, 2010
18,662
hi seb,
Yes.

So to check your equation. replace R2,3,4,5 with values we have used and you should get the same 3V answer if your equation is correct.
OK
E

#### ericgibbs

Joined Jan 29, 2010
18,662
hi Doros,
This is Home work please do not give the TS a final answer.
E

#### Doros

Joined Dec 17, 2013
144
Sorry ericgibbs and seb, won't happen again

#### ericgibbs

Joined Jan 29, 2010
18,662
hi D,
It is not a problem. OK.
We try to make the TS work it out themselves, sometimes it has to be step by step process.
E

#### Doros

Joined Dec 17, 2013
144
well understood

#### BobaMosfet

Joined Jul 1, 2009
2,108