1. Suppose a dc circuit contains three resistances R1 = 22 ohms, R2 = 47 ohms, and R3 = 68 ohms across a battery that supplies a voltage of E = 3.0 V. Find the power dissipated by each resistance.

answers:

P1 = 9/22 = 0.4091 W

P2 = 9/47 = 0.1915 W

P3 = 9/68 = 0.1324 W

2. Suppose we have a series circuit with a supply of 150 V and three resistances: R1 = 330 ohms, R2 = 680 ohms , and R3 = 910 ohms. What is the power dissipated by R2?

answer: 4.15 W

3. Suppose three resistors are in parallel across a battery that supplies E = 12 V. The resistances are R1 = 22 ohms, R2 = 47 ohms, and R3 = 68 ohms. These resistances carry currents I1, I2, and I3, respectively. What is the current, I3, through R3?

answer: 0.18 A

4. In the scenario shown by Fig. 1, what is the voltage across the combination of R3 and R4?

answer: 5.0 V

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