A Battery Has an Emf $\varepsilon = 12 \mathrm {~V}$ And an Internal Resistance

question 86

Multiple Choice

A battery has an emf $\varepsilon = 12 \mathrm {~V}$ and an internal resistance $r = 2.0 \Omega$ , as shown in the figure. When a $3.0 - \Omega$ cable is connected across the battery terminals $a$ and $b$ , the rate at which chemical energy in the battery is depleted is closest to

• A) \(27 \mathrm {~W}\).
• B) \(29 \mathrm {~W}\).
• C) \(24 \mathrm {~W}\).
• D) \(32 \mathrm {~W}\).
• E) \(34 \mathrm {~W}\).

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