Dc Ckt Analysis Ppt1
-
Upload
anjelwicked -
Category
Documents
-
view
223 -
download
0
Transcript of Dc Ckt Analysis Ppt1
![Page 1: Dc Ckt Analysis Ppt1](https://reader033.fdocuments.in/reader033/viewer/2022051303/577cdb5c1a28ab9e78a807ac/html5/thumbnails/1.jpg)
7/28/2019 Dc Ckt Analysis Ppt1
http://slidepdf.com/reader/full/dc-ckt-analysis-ppt1 1/19
DC Circuit Analysis
HRW P639>
![Page 2: Dc Ckt Analysis Ppt1](https://reader033.fdocuments.in/reader033/viewer/2022051303/577cdb5c1a28ab9e78a807ac/html5/thumbnails/2.jpg)
7/28/2019 Dc Ckt Analysis Ppt1
http://slidepdf.com/reader/full/dc-ckt-analysis-ppt1 2/19
Circuit Symbols Resistor
Voltage source (battery)
Switch (open)
Wire (Conductor)
![Page 3: Dc Ckt Analysis Ppt1](https://reader033.fdocuments.in/reader033/viewer/2022051303/577cdb5c1a28ab9e78a807ac/html5/thumbnails/3.jpg)
7/28/2019 Dc Ckt Analysis Ppt1
http://slidepdf.com/reader/full/dc-ckt-analysis-ppt1 3/19
What is a circuit? A basic circuit comprises:
• Voltage source (ex. battery)
• Load (ex. Resistors)• Conductor (ex. Wires)
• Control (ex. Switch)
![Page 4: Dc Ckt Analysis Ppt1](https://reader033.fdocuments.in/reader033/viewer/2022051303/577cdb5c1a28ab9e78a807ac/html5/thumbnails/4.jpg)
7/28/2019 Dc Ckt Analysis Ppt1
http://slidepdf.com/reader/full/dc-ckt-analysis-ppt1 4/19
DC Circuit Analysis
DC Circuits are analyzed in 3 models• Series resistors
•Parallel resistors• Combination resistors
Circuit Analysis investigates:• Equivalent resistance
• Circuit current in/out battery• Voltage drop across components
• Current through components
![Page 5: Dc Ckt Analysis Ppt1](https://reader033.fdocuments.in/reader033/viewer/2022051303/577cdb5c1a28ab9e78a807ac/html5/thumbnails/5.jpg)
7/28/2019 Dc Ckt Analysis Ppt1
http://slidepdf.com/reader/full/dc-ckt-analysis-ppt1 5/19
DC Circuit Analysis - Series
Components are
connected “nose-tail” or
inline There is only one path
for the circuit current (I)
to flow.
![Page 6: Dc Ckt Analysis Ppt1](https://reader033.fdocuments.in/reader033/viewer/2022051303/577cdb5c1a28ab9e78a807ac/html5/thumbnails/6.jpg)
7/28/2019 Dc Ckt Analysis Ppt1
http://slidepdf.com/reader/full/dc-ckt-analysis-ppt1 6/19
Examples of series circuits
![Page 7: Dc Ckt Analysis Ppt1](https://reader033.fdocuments.in/reader033/viewer/2022051303/577cdb5c1a28ab9e78a807ac/html5/thumbnails/7.jpg)
7/28/2019 Dc Ckt Analysis Ppt1
http://slidepdf.com/reader/full/dc-ckt-analysis-ppt1 7/19
Circuit Analysis - Series
![Page 8: Dc Ckt Analysis Ppt1](https://reader033.fdocuments.in/reader033/viewer/2022051303/577cdb5c1a28ab9e78a807ac/html5/thumbnails/8.jpg)
7/28/2019 Dc Ckt Analysis Ppt1
http://slidepdf.com/reader/full/dc-ckt-analysis-ppt1 8/19
DC Circuit Analysis – Series
Equivalent (or total) resistance
• RT = R1 + R2 + R3
Current is the same through allcomponents = circuit current (I)
Voltage drop across each resistor (n)
• Vn = I*Rn • Sum of voltage drops = battery voltage
![Page 9: Dc Ckt Analysis Ppt1](https://reader033.fdocuments.in/reader033/viewer/2022051303/577cdb5c1a28ab9e78a807ac/html5/thumbnails/9.jpg)
7/28/2019 Dc Ckt Analysis Ppt1
http://slidepdf.com/reader/full/dc-ckt-analysis-ppt1 9/19
DC Circuit Analysis – Series
Practice
Analyze the series circuit by
calculating:
• Equivalent resistance RT
• Circuit current (I) flowing
into/out of the battery
• Voltage drop across the 3, 4
and 5 ohm resistor
![Page 10: Dc Ckt Analysis Ppt1](https://reader033.fdocuments.in/reader033/viewer/2022051303/577cdb5c1a28ab9e78a807ac/html5/thumbnails/10.jpg)
7/28/2019 Dc Ckt Analysis Ppt1
http://slidepdf.com/reader/full/dc-ckt-analysis-ppt1 10/19
DC Circuit Analysis - Parallel
Components areconnected “side by side”
There are multiple paths
for the current to flow,splitting into branch currents through R1, R2and R3, according to their
resistive values. The circuit current (I)
flows into/out of thebattery.
![Page 11: Dc Ckt Analysis Ppt1](https://reader033.fdocuments.in/reader033/viewer/2022051303/577cdb5c1a28ab9e78a807ac/html5/thumbnails/11.jpg)
7/28/2019 Dc Ckt Analysis Ppt1
http://slidepdf.com/reader/full/dc-ckt-analysis-ppt1 11/19
Examples of parallel circuits
Ladder analogy
![Page 12: Dc Ckt Analysis Ppt1](https://reader033.fdocuments.in/reader033/viewer/2022051303/577cdb5c1a28ab9e78a807ac/html5/thumbnails/12.jpg)
7/28/2019 Dc Ckt Analysis Ppt1
http://slidepdf.com/reader/full/dc-ckt-analysis-ppt1 12/19
Circuit Analysis - Parallel
![Page 13: Dc Ckt Analysis Ppt1](https://reader033.fdocuments.in/reader033/viewer/2022051303/577cdb5c1a28ab9e78a807ac/html5/thumbnails/13.jpg)
7/28/2019 Dc Ckt Analysis Ppt1
http://slidepdf.com/reader/full/dc-ckt-analysis-ppt1 13/19
DC Circuit Analysis – Parallel
Equivalent resistance
• 1/RT = 1/R1 + 1/R2 + 1/R3
Voltage is the same across all n resistors(V)
Current in each resistor (In)
• In = V/Rn
![Page 14: Dc Ckt Analysis Ppt1](https://reader033.fdocuments.in/reader033/viewer/2022051303/577cdb5c1a28ab9e78a807ac/html5/thumbnails/14.jpg)
7/28/2019 Dc Ckt Analysis Ppt1
http://slidepdf.com/reader/full/dc-ckt-analysis-ppt1 14/19
DC Circuit Analysis – Parallel
Practice
Analyze a parallel
circuit by finding:
• Equivalent resistance
(RT)
• Circuit current (I)
• Current (In) through each
of the resistors Rn
• I1 through R1
• I2 through R2
• I3 through R3
![Page 15: Dc Ckt Analysis Ppt1](https://reader033.fdocuments.in/reader033/viewer/2022051303/577cdb5c1a28ab9e78a807ac/html5/thumbnails/15.jpg)
7/28/2019 Dc Ckt Analysis Ppt1
http://slidepdf.com/reader/full/dc-ckt-analysis-ppt1 15/19
Circuit Analysis - Combo
![Page 16: Dc Ckt Analysis Ppt1](https://reader033.fdocuments.in/reader033/viewer/2022051303/577cdb5c1a28ab9e78a807ac/html5/thumbnails/16.jpg)
7/28/2019 Dc Ckt Analysis Ppt1
http://slidepdf.com/reader/full/dc-ckt-analysis-ppt1 16/19
DC Circuit Analysis – Combo
Resistors are connectedin both series (R3) andparallel (R1, R2) methods
Analyze by starting to
simplify from the inside-out:• Simplify R1 and R2 > R12
• Add result (R12) to R3 for total circuit resistance(Rtot)
Calculate circuit current• I = V/Rtot
Calculate currents throughselected resistances
Shor tcut : Rtot = R3 + 1/(1/R1 + 1/R2)
![Page 17: Dc Ckt Analysis Ppt1](https://reader033.fdocuments.in/reader033/viewer/2022051303/577cdb5c1a28ab9e78a807ac/html5/thumbnails/17.jpg)
7/28/2019 Dc Ckt Analysis Ppt1
http://slidepdf.com/reader/full/dc-ckt-analysis-ppt1 17/19
Parallel part of combo
Consider current (I)
• Passes through R3
in series with battery• Splits so that larger
part goes through the
low value resistor
(Rlow) , and smaller part goes through
high value (Rhigh)
resistor
![Page 18: Dc Ckt Analysis Ppt1](https://reader033.fdocuments.in/reader033/viewer/2022051303/577cdb5c1a28ab9e78a807ac/html5/thumbnails/18.jpg)
7/28/2019 Dc Ckt Analysis Ppt1
http://slidepdf.com/reader/full/dc-ckt-analysis-ppt1 18/19
DC Circuit Analysis – Combo
Practice
Given V = 12V, R1,
R2 and R3 = 1, 2, 3
ohm respectively,calculate:
• Equiv resistance (RT)
• Circuit current (I)
• Current through R2 (I2)
• See next slide
![Page 19: Dc Ckt Analysis Ppt1](https://reader033.fdocuments.in/reader033/viewer/2022051303/577cdb5c1a28ab9e78a807ac/html5/thumbnails/19.jpg)
7/28/2019 Dc Ckt Analysis Ppt1
http://slidepdf.com/reader/full/dc-ckt-analysis-ppt1 19/19
Combo Shortcut for current
R1 and R2 are in parallel, so the voltage
drop across each resistor is the same.
Shortcut for calculating In when there are2 resistors (Rlow and Rhigh) in parallel:
• Ilow = (Rhigh/(Rlow + Rhigh) * circuit current (I)
• Ihigh = (Rlow/(Rlow + Rhigh) * circuit current (I)
We are simply apportioning the current
according to the resistance
• Higher resistance = lower current (and v.v)
Ilow = current through Rlow & Ihigh = current through Rhigh