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Question

https//session.masteringphysics.com/myct/itemView?offset -next&a; ProblemID 58997269 Problem 19.61 Problem 19.61 Part A In the circuit shown in the figure Figure 1), current flows through the 5 00 resistor in the droton shown, and this resistor is measured to be consuming energy at a tate of 24 3 W. The batteries have negligibly small intemal resistance What current does the ammeter A read? of 15.0 V Submit My Answers Gve lb 7.00 Incorrect, Try Again; 5 attempts remaining 2.00 DOLL F6 F10 F11 3 5 6 7 8 0

Explanation / Answer

The power in a resistor is W = V^2/R; thus the voltage across the 5-ohm resistor is V = [W*R]. The voltage across the 5-ohm resistor is then V = [21.3*5] = 11V, positive to the left. This voltage appears across the series combination of 7 ohm and 15V. The voltage across the 7-ohm resistor is 11 - 15 = - 4 and the current is then

I = - 4/7 = - 0.5714 A

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