# Block 3 UNIT I LESSON 4 Basic DC Circuits PARALLEL ... - create

Electronics - Devices

Oct 7, 2013 (4 years and 7 months ago)

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Block 3 UNIT I LESSON 4
Basic DC Circuits PARALLEL CIRCUITS

3-4-19
TEST

All questions in this test refer to the parallel circuit in Figure 11. Read each question
carefully. Write the letter for each correct answer in the blank provided.
Figure 12. Parallel Circuit for Test

1.All the switches in the circuit are OPEN. What do you read when you
place a current meter from TP5 to TP6?

a.0 A
b.2 mA
c.4 mA
d.8 mA

2.You close S1 and place your current meter from TP4 to TP6. What does

a.Zero
b.2 mA
c.4 mA
d.6 mA

3.You keep your meter where it was (TP4 to TP6) and keep S1 closed.
You then close S3. What does your current meter read?

a.Zero
b.2 mA
c.6 mA
d.8 mA

4.You remove your current meter leads. With S1 and S3 still closed, what
would you expect current I
T
to be?

a.Zero
b.4 mA
c.6 mA
d.8 mA
LESSON 4 UNIT I Block 3
PARALLEL CIRCUITS Basic DC Circuits

3-4-20
5.Keeping S1 and S3 closed, you now close S2. How much total current
would you expect to read?

a.Zero
b.8 mA
c.12 mA
d.16 mA

6.What is the total resistance of resistors R1 and R2 in parallel?

a.20 kΩ
b.5 kΩ
c.2.5 kΩ
d.None of the above.

7.What is the total resistance of resistors R3 and R4 in parallel?

a.5 kΩ
b.2.5 kΩ
c.1.666 kΩ
d.1.25 kΩ

8.What is the total resistance of the parallel circuit?

a.5 kΩ
b.2.5 kΩ
c.1.666 kΩ
d.1.25 kΩ

9.With all the switches closed, how much total power do all the resistors
in the circuit dissipate?

a.Zero
b.80 mW
c.160 mW
d.320 mW
10.Imagine that you replace the resistors in the circuit with four 40 W light
bulbs. One of the light bulbs then burns out. How much total current
does the voltage source still supply?

a.Zero
b.1.5 A
c.6 A
d.12 A