EMF and Internal Resistance (1)

1. Oct 9, 2008

SJN

1. The problem statement, all variables and given/known data
A torch bulb is marked 2.5V and 0.3A. When it is connected to a dry battery of e.m.f 3.0V the correct p.d of 2.5V is produced across it. Calculate the internal resistance if the battery.

2. Relevant equations
I=V/R?

3. The attempt at a solution
It's on paper - sorry!

Answer = 1.67 - But how you get to that is the question - working out must be shown.

Thanks in advance,
Sam

Last edited: Oct 9, 2008
2. Oct 9, 2008

Hootenanny

Staff Emeritus
We do not provide solutions here. We will help you will your homework, but you have to show some effort first, by typing out your attempted solution for example.

The same goes for your other thread, "I don't know how to start" isn't an attempted solution.

3. Oct 9, 2008

SJN

OK Sorry,

It's just I tried to find my tutor today, and couldn't see him, so i'm a little puzzled.

Not to worry, have a good day.

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