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Question
Sat July 21, 2012

# EMF is the maximum potential difference between 2 electrodes,when no current is drawn from the cell.Does this mean that the cell is not in use or all the free electrons have perished?

Mon July 23, 2012
Actually the term EMF is developed to suggest the total potential diffference which a cell can provide
given that the internal resistance of the cell is ignored.
ZTo ignore the potential drop across the internal resistance we have to consider the assumption that the current drawn from the cell is zero, i.e is no current passes through the intrnal resistance of cell.
Related Questions
Wed January 18, 2017

# A cell of emf E and internal resistance r is connected to two external resistance R1 and R2 and a perfect ammeter.The current in the circuit is measured in four different situation: (i)without any external resistance in the circuit (ii)with resistance R1 only (iii)with Ri and R2 in series combination (iv)with R1 and R2 in parallel combination The currents measured in the four cases are 0.42A,1.05A,1.4A and 4.2A,but not necessarily in that order.Identify the currents corresponding to the four cases mentioned above.

Thu November 24, 2016

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