R 1 = 35 R 2 = 20 R 3 = 5 R 4 = 65 R 5 = 50 R 6 = 45 Problem 23.52 MC The circui

Question

  R1 = 35   R2 = 20   R3 = 5      R4 = 65   R5 = 50   R6 = 45 Problem 23.52 MC The circuit shown (Figure 1) is made with resistors, each of which have a maximum power usage of 0.5 W. Assume the following resistor values. Figure 1 of 1 the circuit. How much current will flow through R4 when it is using 0.5 W of power? Express your answer using three significant figures. I 8.77x10 2 A Submit My Answers Give Up Correct Part C What is the maximum emf of the battery that can be used to run this circuit? Express your answer using three significant figures. Submit Hints My Answers Give Up Review Part

Explanation / Answer

current through R4= current through the battery= i= 8.77x10^-2 A

now we need to first find the equivalent resistance of the circuit

R1 and R2 are in parallel, so R12=(1/35 + 1/20)^-1 =12.73 ohms.

R5 and R6 are in parallel, so R56= (1/50+ 1/45)^-1=23.68 ohms

now R12, R56, R3 and R4 are in series, so equivalent resistance of circuit=R12+R56+R3 and R4.

Rnet= 12.73 + 23.68+5+65=106.4 ohms

so the maximum emf= i Rnet

E=8.77x10^-2 (106.4)=9.33

so E=9.33 V.

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