questions 1 & 2 please need help! questions 1 & 2 please need help! ame FIGURE 1

Question

questions 1 & 2 please need help! questions 1 & 2 please need help! ame FIGURE 18-11 R, Points: 10 1) For the circuit shown in Fig. 18-11, R 1-45 , R2-80OR3-12.0, -12. volts. Find: (a) the total resistance connected to the battery. (b) the current in each resistor. Points: 2 2) Four 20. resistors are connected in parallel. What is the equivalent resistance? 2) FIGURE 18-13 I, T2 Ry Rs V. Points: 10 3) See Fig. 18-13. Given R1 = 18. , R2-44. , R3-33. , R4 = 14. , R5-12Q, V1 = 18. volts, andV2° 12, volts: (a) determine l1. (b) determine l2 Points: 4 -4) Two resistors in series equal 9.0 ohms total: but the same two resistors in parallel are equivalent to 2.0 ohms. What are the resistor values?

Explanation / Answer

1. (A) R2 and R3 are in parallel connection.

1/R = 1/R2 + 1/R3

1/R = 1/8 + 1/12

R = 4.8 ohm

now R and R1 are in series,

Req = R + R1 = 9.3 ohm

(B) current through battery,

I = e / Req = 1.29 A

current through R1, I1 = I = 1.29 A

current through R2, I2 = (1.29)(12)/(12 + 8)

I2 = 0.774 A

CURRENT through R3, I3 = I - I2 = 0.516 A

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