- #1

ingram010

- 14

- 0

I am looking for a formula to work out the following-

500v---/\/\/\/\/---X---/\/\/\/\/---0v

1megohm 10kohm

what is X?

cheers

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- Thread starter ingram010
- Start date

- #1

ingram010

- 14

- 0

I am looking for a formula to work out the following-

500v---/\/\/\/\/---X---/\/\/\/\/---0v

1megohm 10kohm

what is X?

cheers

- #2

denverdoc

- 963

- 0

Welcome to PF. Its not clear at least to me what the problem is, is X an unknown voltage. If so

use V=iR first compute i using the total series resistance (here the sum of 1Mohm and 10Kohm.

Then V is just the i*the resistance over which you want to find voltage.

or all in one v=500*R/(R+r) This is just voltage divider eqn. Thats the voltage across the first resistance, voltage across the second would be:

500*r/(R+r), if your looking for the value of x, this would be the one to use.

use V=iR first compute i using the total series resistance (here the sum of 1Mohm and 10Kohm.

Then V is just the i*the resistance over which you want to find voltage.

or all in one v=500*R/(R+r) This is just voltage divider eqn. Thats the voltage across the first resistance, voltage across the second would be:

500*r/(R+r), if your looking for the value of x, this would be the one to use.

Last edited:

- #3

ingram010

- 14

- 0

Hi, on reflection it isnt very clear. Sorry.

how about this-

500v---\/\R1\/\----X----\/\R2\/\---0v

If R1 = 1Mohm and R2 = 10Kohm

what is the voltage at X?

Or this one -

500v---\/\R1\/\--X--\/\R2\/\--Y--\/\R3\/\--Z--\/\R4\/\---0v

If R1 = 1Mohm, R2 = 10Kohm, R3 = 10Kohm and R4 = 10Kohm

what is the voltage at X,Y and Z?

is there a simple calculation for this problem?

- #4

DAKONG

- 15

- 0

then use Ohm's law

V=IR

500=I(10

I = ?

:grumpy:

V = IR

X - 0 = I(R

:grumpy:

V = IR

500 - X = I(R

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