Q. 24.4( 87 Votes )

A battery of emf 10 V and internal resistance 3 W is connected to a resistor. If the current in the circuit is 0.5 A, what is the resistance of the resistor? What is the terminal voltage of the battery when the circuit is closed?

Answer :

The diagram is given as:



Given: Electromotive force (E) of battery = 10 volt.


Internal Resistance r of the battery = 3 Ω


Current in the Circuit (I) = 0.5 A


Let the resistance of the required resistor is R Ω


Let the Terminal voltage of the register be V.


As per Ω ’s law,





R + r = 20 Ω


r = 3Ω


Resistance of Resistor is 17 Ω.


Also, as per Ohm’s law,


V = IR


V = 0.5A × 17Ω =


V = 8.5V


Terminal voltage of the register is 8.5V.


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