A Battery Has an Emf ε = 78

question 124

Multiple Choice

A battery has an emf ε = 78.0 V and an internal resistance r = 4.0 Ω,as shown in the figure.A current of 4.7 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)280 W.
• B)340 W.
• C)320 W.
• D)300 W.
• E)370 W.

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