Question 11: NCERT Solutions for 12th Class Physics: Chapter 3-Current Electricity
A storage battery of emf 8.0 V and internal resistance 0.5 Ω is being charged by a 120 V dc supply using a series resistor of 15.5 Ω. What is the terminal voltage of the battery during charging? What is the purpose of having a series resistor in the charging circuit?
Now, terminal voltage of the battery during charging
V = E + lr = 8 + 7(0.5) = 11.5 V A series resistance is joined in the charging circuit to limit the excessive current so that charging is slow and permanent.
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NCERT Solutions for 12th Class Physics: Chapter 3-Current Electricity