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

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

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Prob. 7

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80V

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

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

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

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

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

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

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

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Voltage Current Resistance R1 R2 Total 10 V

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

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

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

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

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

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n Example 14-2

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n Example 14-3

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Example 14-4

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Assignment n Problems Ch14: 1-4

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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

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

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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

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

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