Analysis of complex circuits - by example

1. Unit 3 – Lesson 5Unit 3 – Lesson 5
Complex CircuitsComplex Circuits
Nelson Reference 531-535Nelson Reference 531-535
(McGraw Hill Reference 643 – 646)(McGraw Hill Reference 643 – 646)

2. What is a complex circuit?
Ans. A circuit composed of both series andA circuit composed of both series and
parallel circuits. These circuits can be veryparallel circuits. These circuits can be very
difficult to solve (finddifficult to solve (find Req, all, all V andand I values).values).
Example: Determine: Req, IDetermine: Req, ISS, I, I11, I, I2,2, II3,3, VV1,1, VV2,2, VV33
V S
IS
R 1
R 3
R 2
R 1
= 1 5 .0
R 2 = 5 .0
R 3
= 2 .0
V S
= 1 2 .0 V

3. The hardest part is to find where to start theThe hardest part is to find where to start the
circuit analysis. For the given circuit, thiscircuit analysis. For the given circuit, this
is theis the dotted portion, which is a
________ circuit with respect to the circuit.
The circuit analysis will be done on the
chalkboard.
Answers:
Req = 15/4 Ω +2.0 Ω = 5.75 Ω,
I1 = 0.5 A, I2 =1.6 A, I3 = IS = 2.1 A,
V1 =V2 = 7.8 V, V3 = 4.2 V

4. Textbook (McGraw Hill)
Page 666 #18 (See CCT written on board)Page 666 #18 (See CCT written on board)
Determine all values of I, R and VDetermine all values of I, R and V
Nelson textbook
Page 535 #1-4Page 535 #1-4
Page 543 # 47, 56, 64Page 543 # 47, 56, 64
Additional Circuit Questions (for Review)
Workbook: Page 52 # 9, 10, 18

5. Additional Questions
Textbook (McGraw Hill)
Page 646 # 36 (close the switch!), 37Page 646 # 36 (close the switch!), 37

6. Additional Questions
Textbook (McGraw Hill)
Page 646 # 36 (close the switch!), 37Page 646 # 36 (close the switch!), 37