EET 110 - Survey of Electronics

Chapter 14 - Series-parallel circuits

Homework Problems - Ch. 12

Find all unknown values of V, I, R and P

Prob. 7

80V

Homework problems - Ch. 13

#1 - Find all unknown V, I, R, and P for:

Voltage Current Resistance Power

R1

R2

Total

R3

8

10

4

40 v

Problem 2 - values of V, I, R, and P

I2=4A

Voltage Current Resistance Power

R1

R2

Total

R3

20

50 v

4 A

#3 - Find V, I, R, and P

I1=22mA

Voltage Current Resistance Power

R1

R2

Total

4.7 k

22 mA

3.3 k

#4 - find V, I, R, and P10 V

Voltage Current Resistance

R1

R2

Total

10 V

Series-Parallel Circuits

Circuits having components in both Series and Parallel connection have some basic relationships that provide a simple solution.

Kirchhoff’s Voltage Law

For a ‘closed loop’, the sum of voltages is zero

For this circuit, – VT = V1 + V2 + V3

“Around a closed loop, the algebraic sum of all the voltages is zero.”

Kirchhoff’s Current Law “The current entering any point in a circuit

is equal to the current leaving that same point.”

Solving Series-Parallel Circuits

Use a combination of Kirchhoff’s laws, and resistor calculations we can solve the circuit

Example 14-2

Example 14-3

Example 14-4

Assignment

Problems Ch14: 1-4

Exam 1 Review

Chapters 1-14 Electrical Units

– Volts, Amps, Watts, Watt-hours Resistance

– Ohms– Resistor Color Code– Series/Parallel equivalent

Ohms Law Forms

Exam 1 Review

Series Circuits– Current is same– Voltage Divider Rule

Parallel Circuits– Voltage is the same– Current Divider Rule

Exam 1 Review

Series-Parallel Circuits– Back and forth

Kirchoff’s Laws– Current – at a node current in=current out

Sum = 0

– Voltage – around closed loop, voltage rises = voltage drops

Sum = 0

Exam 1 – Review

Schematic symbols/diagrams Bring

– Formula sheet– Calculator– Straight edge– Scratch paper