A Battery Has an Emf $\varepsilon = 78.0 \mathrm {~V}$ And an Internal Resistance

question 371

Multiple Choice

A battery has an emf $\varepsilon = 78.0 \mathrm {~V}$ and an internal resistance $r = 4.0 \Omega$ , as shown in the figure. A current of $4.7 \mathrm {~A}$ is drawn from the battery when a resistor $R$ is connected across the terminals a and $b$ . The power dissipated by the resistor $R$ is closest to

• A) \(300 \mathrm {~W}\).
• B) \(280 \mathrm {~W}\)
• C) \(320 \mathrm {~W}\).
• D) \(370 \mathrm {~W}\).
• E) \(340 \mathrm {~W}\).

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