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.

Question

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.

Quizplus · Accepted Answer

The Answer of 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.

A Battery Has an Emf ε = 78