EMF - Question Problem!?!?!

  • 0 votes

I'm completing a Physics Unit 1 AQA paper (June 2011). Question 6bi) It gives a current/voltage graph of the EMF of a cuircit and then asks for me to caluclate the EMF from it. How do I do this? I've tried calculating the gradient and using calculations but can't get the answer the mark scheme gives. Please help! :)

Posted Wed 9th January, 2013 @ 14:00 by Gaby Coghlan

1 Answer

  • 0 votes

For these questions:

The GRADIENT gives the negative internal resistance.

The Y-INTERCEPT (i.e. where the line crosses the y-axis) gives the EMF. So quite simply, for this question, you need to read of the value of the y-intercept. That should give you the EMF.

Answered Fri 11th January, 2013 @ 21:04 by usycool1