A battery has an open circuit potential difference 10 V between the terminals. When loads 9 Ω and 4 Ω are connected one by one across the battery, the power in the load resistance is the same. The amo

Question

A battery has an open circuit potential difference $10 V$ between the terminals. When loads $9 Ω$ and $4 Ω$ are connected one by one across the battery, the power in the load resistance is the same. The amount of heat approximately generated in one second in the load when a load of $5 Ω$ is connected across the battery will be

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Answer:

D

Solution:

Given: $\frac{v^{2}}{{[9 + r]}^{2}} 9 = \frac{v^{2}}{{[4 + r]}^{2}} 4$

$\Rightarrow r = 6$

$∴ H = {(\frac{10}{11})}^{2} \times 5 \times 1 = 4.13 J$

TestHub · Accepted Answer

Given: v 2 9 + r 2 9 = v 2 4 + r 2 4 ⇒ r = 6 ∴ H = 10 11 2 × 5 × 1 = 4.13 J

Physics - Current Electricity Question with Solution | TestHub

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