Questions
In an electric circuit shown in the figure, the external resistance R is variable. It is found that same power is developed in external resistance R if its value is either . With this information find the internal resistance (r) of the voltage source.
detailed solution
Correct option is D
I= ER+r, P=I2R=E2RR+r2Now P1=P2 ⇒ E255+r2 = E22020+r2 ⇒ r=10 ΩTalk to our academic expert!
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A resistor R is connected across a battery of emf 12 V. It observed that terminal potential differenceis 9 V and the power delivered to resistor is 18 W. Internal resistance of the battery ‘r’ and the resistance R are respectively
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