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What is the equivalent resistance of the circuit? a. 4? b. 6? c. 8? d. 10? 2? 20 A. 62 42 B. 20 252 20. Four resistors of values 2 ?, 4 ?, 3 ?, and 9 ? respectively are connected across an 8-V DC source with voltage V as shown in the figure. What is the current through the 9-? resistor? an a. 1.3 A b. 0.7 A c. 0.9 A d. 1.6 A 30 90

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Answer #1

19) for the net resistance

R1 = 2 + 2 + 4 + 2 + 2 = 12 Ohm

for 6 Ohm and 12 Ohm in parallel

Req = 2 + 2 + 12 * 6/(12 + 6)

Req = 8 Ohm

the net resistance is c) 8 Ohm

20)

for the current in 9 Ohm

current in 9 Ohm = 8/(3 + 9)

current in 9 Ohm = 0.67 A = 0.7 A

The current through 9 Ohm is 0.7 A

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