Chapter 5. Parallel Circuits ISU EE. C.Y. Lee


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1 Chapter 5 Parallel Circuits
2 Objectives Identify a parallel circuit Determine the voltage across each parallel branch Apply Kirchhoff s current law Determine total parallel resistance Apply Ohm s law in a parallel circuit Use a parallel circuit as a current divider Determine power in a parallel circuit
3 esistors in Parallel A parallel circuit is one that has more than one branch 3
4 Voltage in Parallel Circuits The voltage across any given branch of a parallel circuit is equal to the voltage across each of the other branches in parallel 4
5 Voltage in Parallel Circuits Example: Determine the voltage across each resistor V = V = V 3 = V 4 = V 5 = 5 V 5
6 Kirchhoff s Current Law (KCL) The sum of the currents into a node is equal to the sum of the currents out of that node I IN() + I IN() I IN(n) = I OUT() + I OUT() I OUT(m) 6
7 Generalized Circuit Node Illustrating KCL I IN() + I IN() I IN(n) = I OUT() + I OUT() I OUT(m) or I IN() + I IN() I IN(n) I OUT() I OUT()... I OUT(m) = 0 7
8 Kirchhoff s Current Law Example: Determine the current through I = = 50 ma 8
9 Total Parallel esistance The total resistance of a parallel circuit is always less than the value of the smallest resistor / T = / + / + / / n 9
10 Total Parallel esistance Example: Calculate the total parallel resistance T = 3 = + + T T = T = /((/00) + (/47) + (/)) = 3.0 Ω 0
11 Application of a Parallel Circuit One advantage of a parallel circuit over a series circuit is that when one branch opens, the other branches are not affected
12 Application of a Parallel Circuit All lights and appliances in a home are wired in parallel The switches are located in series with the lights
13 Ohm s Law in Parallel Circuits V = I, I = V/, and = V/I Example: Find the each current in below circuit T = /(/00 + /56) = 35.9 Ω I I I T = V S / T = 0/35.9 = 79 ma I = 0/00 = 00 ma I = 0/56 = 79 ma 3
14 Current Dividers A parallel circuit acts as a current divider because the current entering the junction of parallel branches divides up into several individual branch currents I T I I T I 4
15 CurrentDivider Formulas for I T I I Two Branches The total current divides among parallel resistors into currents with values inversely proportional to the resistance values I T 5 T I = = I I I T = = T = I + + T T + + = ( ) I T ( ) I T
16 CurrentDivider Formulas for Two Branches Example: Find the each current in below circuit I I I = 0(000/(00+000)) = 9.09 ma I = 0(00/(00+000)) = ma 6
17 General CurrentDivider Formula General currentdivider formula for any number of parallel branches I = X T X ( I ) T 7
18 Power in Parallel Circuits Total power in a parallel circuit is found by adding up the powers of all the individual resistors, the same as for series circuits P T = P + P P n P T = IV S P = I VS PT = T T T T = /(/68 + /33 + /) =. Ω P T = () (.) = 44.4 W 8
19 Open Branches When an open circuit occurs in a parallel branch, the total resistance increases, the total current decreases, and the same current continues through each of the remaining parallel paths 9
20 Open Branches When a lamp filament opens, total current decreases, the other branch currents remain unchanged I I I I I I I 4I 3I 0
21 Summary A parallel circuit provides more than one path for current The total parallel resistance is less than the lowestvalue parallel resistor The voltages across all branches of a parallel circuit are the same Kirchhoff s Current Law: The sum of the currents into a node equals the sum of the currents out of the node Kirchhoff s Current Law may also be stated as: The algebraic sum of all the currents entering and leaving a node is zero
22 Summary A parallel circuit is a current divider The total power in a parallelresistive circuit is the sum of all the individual powers of the resistors making up the parallel circuit If one of the branches of a parallel circuit opens, the total resistance increases, and therefore the total current decreases If a branch of a parallel circuit opens, there is no change in current through the remaining branches
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