A battery has an emf of 15 V and internal resistance of 1 Ω Ω . If the terminal to terminal potential difference less than equal to or greater than 15 V if the current in the battery is (1) from negative to positive terminal, (2) from positive to negative terminal, (3) zero current?
Text Solution
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If 
is the emf of the battery, 
the internal resistance, 
the current drawn and 
the 
across the plates of battery, then
Case 1: When the direction of current in the battery is from 
to 
or outside 
to 
, then
(during discharging)
Case II: When the direction of current in the battery is from 
to 
or outside 
to 
, then
(during charging)
Case III : When zero current, then
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