 # EET 110 - Survey of Electronics Chapter 14 - Series-parallel circuits.

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EET 110 - Survey of Electronics Chapter 14 - Series-parallel circuits

Homework Problems - Ch. 12 n Find all unknown values of V, I, R and P

Prob. 7

80V

Homework problems - Ch. 13 n #1 - Find all unknown V, I, R, and P for:

Voltage Current ResistancePower R1 R2 Total R3 8  10  4  40 v

n Problem 2 - values of V, I, R, and P I2=4A

Voltage Current ResistancePower R1 R2 Total R3 20  50 v 4 A

n #3 - Find V, I, R, and P I1=22mA

Voltage Current ResistancePower R1 R2 Total 4.7 k  22 mA 3.3 k 

n #4 - find V, I, R, and P 10 V

Voltage Current Resistance R1 R2 Total 10 V

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

Kirchhoff’s Voltage Law n For a ‘closed loop’, the sum of voltages is zero

n For this circuit, – VT = V1 + V2 + V3 n “Around a closed loop, the algebraic sum of all the voltages is zero.”

n Kirchhoff’s Current Law n “The current entering any point in a circuit is equal to the current leaving that same point.”

Solving Series-Parallel Circuits n Use a combination of Kirchhoff’s laws, and resistor calculations we can solve the circuit

n Example 14-2

n Example 14-3

Example 14-4

Assignment n Problems Ch14: 1-4

Exam 1 Review n Chapters 1-14 n Electrical Units – Volts, Amps, Watts, Watt-hours n Resistance – Ohms – Resistor Color Code – Series/Parallel equivalent n Ohms Law n Forms

Exam 1 Review n Series Circuits – Current is same – Voltage Divider Rule n Parallel Circuits – Voltage is the same – Current Divider Rule

Exam 1 Review n Series-Parallel Circuits – Back and forth n Kirchoff’s Laws – Current – at a node current in=current out n Sum = 0 – Voltage – around closed loop, voltage rises = voltage drops n Sum = 0

Exam 1 – Review n Schematic symbols/diagrams n Bring – Formula sheet – Calculator – Straight edge – Scratch paper

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