Internal resistance Definition and 157 Threads

A battery of e.m.f. 4.5V is connected across a 12 ohm resistor, if the Pd. Across the resistor is 3V calculate a)the current in the circuit ? b)internal resistance of the battery? iv tried my best but i can't do it

Hey, I'm revising for my summer exams, and gotten stuck on this particluar question. _______ 6V ______2.0 ohms___ I I A I I I I I_____4.0...

What causes internal resistance in the following: A) A Cell, B) A Solar Cell? Is it not just the same thing? Thanks in advance. :smile:

I'm doing an experiment to measure the internal resistance of a zinc carbon cell (battery) and have slightly confused myself! Do I use the ε= IR + Ir formula? And if so how in the world do I use it! I know that I can work out R by using V and I values but how do I find the EMF of the battery...

The answer to the attachment is if the R resistance was equal to the internal resistance. How was this determined? Please explain this to me because i have no idea how they can solve this. Thanks

I am currently doing a lab trying to calculate internal resitance of a battery. Do I use the formula V=IR?

Hey I am confused as to the answer to this question; not sure exactly how to figure out what the answer is because it is not a constant resistance. Any help appreciated: The potential difference across the terminals of a battery is V_1 when there is a current of I_1 in the battery from the...