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Standard XII

Physics

Power in an AC Circuit

Two cells, ea...

Question

Two cells, each of emf E and internal resistance r, are connected in parallel across a resistor R. The power delivered to the resistor is maximum if R equal to

r/2

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Solution

The correct option is A r/2
The condition for delivering maximum power is that the external resistance is equal to the internal resistance.
Here, $R_{A B} = R = \frac{r r}{r + r} = \frac{r}{2}$

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Two cells, each of emf E and internal resistance r, are connected in parallel across a resistor R. The power delivered to the resistor is maximum if R equal to

The correct option is A r/2The condition for delivering maximum power is that the external resistance is equal to the internal resistance.Here, RAB=R=rrr+r=r2

The correct option is A r/2
The condition for delivering maximum power is that the external resistance is equal to the internal resistance.
Here, $R_{A B} = R = \frac{r r}{r + r} = \frac{r}{2}$