Here is the "Electricity  Basic Navy Training Courses"
(NAVPERS 10622) in its entirety. It should provide one of the Internet's
best resources for people seeking a basic electricity course  complete with examples
worked out. See
copyright. See
Table of
Contents. • U.S. Government Printing Office; 1945  618779
Note: A value written as 11/4 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.
