Question involving EMF and internal resistance

AI Thread Summary
The discussion revolves around calculating the electromotive force (EMF) and internal resistance of a cell based on two scenarios with different resistances. When a 5-ohm resistor is connected, the current measured is 2 Amperes, while a 9-ohm resistor yields a current of 1.2 Amperes. The problem requires applying the relationship between EMF, internal resistance, and the external resistance to derive the values. The initial poster is reminded to follow forum rules and provide more context in future queries. The conversation emphasizes the need for a structured approach to solving electrical circuit problems.
Anveshan
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A cell supplies a current of 2 Ampere, when it is connected to 5 ohm resistance and supply a current of 1.2 Ampere. If it is connected to resistance of 9 ohm, find EMF(electro motive force) and Internal Resistance
 
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Anveshan said:
A cell supplies a current of 2 Ampere, when it is connected to 5 ohm resistance and supplies a current of 1.2 Ampere if it is connected to resistance of 9 ohm. Find EMF(electro motive force) and Internal Resistance

Hi Anveshan, welcome to PF.

This is your first thread, but next time follow the rules of the Forums, please. You need to use the Template provided and show what you know and what you tried in order to solve the problem. I corrected a bit the problem text. So you connect an R1= 5Ω resistance to a cell and measure the current in the loop: it is I1= 2 A. Then you change the resistance, and connect an R2=9Ω resistance to the cell: The current becomes I=1.2 A. Did you mean so?

How do you calculate the current in a loop that contains a cell with emf E and internal resistance r and an outer resistance R?

ehild
 
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