Question

Question 8 (1 point) R2 W R3 In the following circuit, R1=14 Ohm, R2=4" 1.4 Ohm, R3=41.4 Ohm, R4-2 1.4 Ohm, R5-14 Ohm and E= 14 Volt. Calculate the current in R5 resistor. (Picture File-Ohm-2.jpg] Your Answer: Answer units Question 9 (1 point) The equivalent resistance of the following circuit is 6.72 ohm. R1= 2.92 ohm, R2-2 2.92 ohm, R3=3*2.92. What is R4? [Picture File - Ohm-4.jpg] Your Answer: Answer units

Answer 1

here,

8)

R2 , R3 and R4 are in parallel, let their equivalent resistance be R6

1/R6 = 1/R2 + 1/R3 + 1/R4

1/R6 = 1/(4 * 1.4) + 1/(4 *1.4) + (2 * 1.4)

R6 = 1.4 ohm

the current through R5 , I5 = E /(R1 + R5 + R6)

I5 = 14 /(14 + 14 + 1.4 ) A

I5 = 0.48 A

9)

(R2 and R3) are in series , their equivalent resistance , R5 = R2 + R3 = 14.6 ohm

R4 and R5 are in parallel , their equivalent resistance , R6 = R4 * R5 /(R4 + R5)

R6 and R1 are in series , the equivalent resistance , Req = R1 + R6

6.72 = 2.92 + R4 * R5 /(R4 + R5)

6.72 = 2.92 + R4 * 14.6 /(R4 + 14.6)

solving for R4

R4 = 5.14 ohm