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internal resistance equation

hhhhhhhhhhppppp

sorry can someone please rearrange:

E = V - Ir

to find r? I've been trying for ages and am really confused :confused:

Reply 1

Mohit_C

E = V - Ir

E + Ir = V

Ir = V - E

r = V - E/I

Anyone else confirms on this one?

Reply 2

Mattywat

Just rearrange?

E = V -Ir

E - V = -Ir

(E - V) / -I = r

r = (V -E) / I

Like Mohit C said.

Reply 3

hhhhhhhhhhppppp

thank you! I feel really dumb for having to ask that...

Reply 4

Stranded

lozzyjay

thank you! I feel really dumb for having to ask that...

That's OK. Everyone gets a bit nervous when it's exam time :smile:

Reply 5

Troyes

Isn't it E = V +ir?

Reply 6

~Bex~

It's V=E-IR, so yeh E=V+IR

Reply 7

teachercol

so the final equation should be

r = (E-V) / I

Reply 8

Ginger_J

what about to find current I?

Reply 9

Eimmanuel

Study Forum Helper

Original post by Ginger_J

what about to find current I?

Hi Ginger_J,

Welcome to TSR. :smile:

This thread had been a pretty old thread and if you have any new question, I would recommend that you start a fresh thread and explain your question and confusion.

As for your question of finding current, it is just simple manipulation of the expression.

Current = (E-V)/r

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