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ICSE Class 10 Answered

Please explain the determination of internal resistance of a cell
Asked by lovemaan5500 | 09 Oct, 2017, 05:49: AM
answered-by-expert Expert Answer
Potential difference (PD) is measured taking into consideration the resistance (i.e. resistance of external circuit) other than the resistance provided by the cell. EMF or electromotive force is measured taking into consideration the resistance of external circuit as well as resistance offered by cell itself.
 
Internal resistance can be defined as the resistance offered by the material contained inside the cell, to the flow of electric current.
 
Formula for determination of internal resistance of a cell is  begin mathsize 12px style straight r equals straight E over straight I minus straight R end style
Circuit diagram:
 
 
 
Here,
r= Internal resistance of the cell
E= Electro-motive force of the cell
R= Resistance of external circuit
I= Electric current in the circuit
 
PS:- Answered within the context of question. 
Answered by Abhijeet Mishra | 09 Oct, 2017, 03:54: PM

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