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) $340 \mathrm {~W}$.

Question

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) $340 \mathrm {~W}$.

Quizplus · Accepted Answer

The Answer of 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) $340 \mathrm {~W}$.

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

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