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Note: A value written as 1-1/4 should be interpreted as "one and a quarter" (1.25), not "one minus a quarter" (0.75). The dash is akin to a hyphen connecting the whole number to the fraction. **Chapter 9 QUIZ**
**PARALLEL CIRCUITS**
1. Work out the answers for each unknown in the practice circuits in the following drawing. 2. Four motors are paralleled on a 120 volt line. What is the total line current if each motor draws 2.5 amperes? 3. What is the total resistance of one 10 ohm resistor, one 20 ohm resistor, and one 30 ohm resistor if they are connected in parallel? 4. Two loads are connected in parallel on a 220 volt line. The first draws 25 amperes and the second draws 41 amperes. What is the total current? What is the total resistance? 5. In a 120 volt parallel circuit there are four devices. One requires 1/2 ampere, another 1/4 ampere, another 1−1/4 amperes, and the fourth 3 amperes. What is the total current required? 6. What is the resistance of each device in problem 5? What is the total resistance? <Answers below> Return to Chapter 9 **Chapter 9 ANSWERS**
**PARALLEL CIRCUITS**
1. A: E_{1} = 12 V., E_{2} = 12 V., E_{3} = 12 v. B: I_{t} = 15A. C: R_{t} = 2 ohms. D: R_{t} = 2 ohms. 2. 10 amps. 3. 5.45 ohms. 4. 66 amps. 3.33 ohms. 5. 5 amps. 6. 240 ohms. 480 ohms. 96 ohms. 40 ohms. R_{t} = 24 ohms. |