Recent content by joseppi

2A = ?E/ (4.0 Ohms + ?r) 1.5A = ?E/ (6.0 Ohms + ?r) I'll be honest I am quite bad with Maths even though I take AS level physics. I have no clue how to eliminate the r or E unknown or even really how to move it around ;/ You couldn't explain how and why you do this? It would be a great help...

Hi, sorry for me not having understood your instruction but how can I use the below equation for the answer if I have neither the: r or the E value? I = E/(R + r) x

Basically I have been given this question: A battery of unknown EMF and internal resistance is connected in series with an ammeter and a resistance box. The current was 2.0A when R= 4.0 Ohms and 1.5A when R= 6.0 Ohms. Calculate the EMF and internal resistance. I feel you may have to...