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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?



Return to Chapter 9

















 

Chapter 9 ANSWERS

PARALLEL CIRCUITS



1. A:E1 = 12 V.,  E2 = 12 V., E3 = 12 v.  B:It = 15a.,  C:Rt = 2 ohms.  D:Rt = 2 ohms.

2. 10 amps.

3. 5.45 ohms.

4. 66 amps.  3.33 ohms.

5. 5 amps.

6. 240 ohms,  480 ohms,  176 ohms,  40 ohms,  24 ohms.
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