NCERT Class XII Chapter
Current Electricity
Questions With Solutions
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Question : 11
Total: 24
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?
Solution:
During charging, the electric current is sent into the 8.0 V battery.
The current in the circuit
I =
or I =
Now, terminal voltage of the battery during charging
V = E + Ir = 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.
The current in the circuit
I =
or I =
Now, terminal voltage of the battery during charging
V = E + Ir = 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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