Resistors Capacitors
-
Upload
muhammad-adnan-malik -
Category
Documents
-
view
262 -
download
3
description
Transcript of Resistors Capacitors
![Page 1: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/1.jpg)
Basic ElectronicsLecture#3
RESISTORS/Capacitors
By: Engr. Muhammad Adnan Malik
Class of BS.IT, ISP
![Page 2: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/2.jpg)
Series and Parallel Combinations of Resistors
• Series Combination
• Parallel Combination
![Page 3: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/3.jpg)
Proper ties of Series Combinations of Resistors
•In Series combination of resistors current across each resistor is same •In Series combination of resistors, voltage across each resistor voltage is different.
![Page 4: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/4.jpg)
Proper ties of Series Combinations of Resistors
![Page 5: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/5.jpg)
Properties of Parallel Combinations of Resistors
•In Series combination of resistors current across each resistor is different.• In Series combination of resistors voltage across each resistor is voltage is same.
![Page 6: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/6.jpg)
Properties of Parallel Combinations of Resistors
![Page 7: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/7.jpg)
Total resistance in Series
![Page 8: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/8.jpg)
Total resistance in series
•When Resistance are in series, total resistance is gives by:
![Page 9: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/9.jpg)
Total resistance in Parallel
![Page 10: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/10.jpg)
Warm Up Yourself!! Series Circuit
![Page 11: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/11.jpg)
Series Circuit
•Two resistances R1 and R2 of 5ohm each and R3 of 10ohm are in series. How much is Rt ? With 80 V applied across the series string of resistors, how much is the current in R3 ?
RT =R1+R2+R3 =5 +5 +10 Rt=20 I =Vt/Rt= 80/20 I =4 A
Power In R3?P=640 W
![Page 12: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/12.jpg)
Parallel Circuit
![Page 13: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/13.jpg)
Parallel Circuit
![Page 14: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/14.jpg)
Both Series & Parallel Circuit
![Page 15: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/15.jpg)
Both Series & Parallel Circuit
![Page 16: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/16.jpg)
Both Series & Parallel Circuit
![Page 17: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/17.jpg)
Kirchhoff ’s Voltage Law (KVL)•Kirchhoff’s voltage law states that the sum of all resistor voltage drops in a series circuit equals the applied voltage. •Expressed as an equation, Kirchhoff’s voltage law is
VT =V1 +V2 +V3
![Page 18: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/18.jpg)
Kirchhoff ’s Current Law (KCL)•Kirchhoff’s current law (KCL) states that the total current It in the main line of a parallel circuit equals the sum of the individual branch currents.•Expressed as an equation, Kirchhoff’s current law is
It = I1 +I2 I3
![Page 19: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/19.jpg)
KVL-An Example•A voltage source produces an IR drop of 40 V across a R1=20ohm , 60 V across a R2=30ohm , and 180 V across a R3=90ohm , all in series. According to Kirchhoff’s voltage law, how much is the applied voltage V T ?
Vt=40+60+90=280V
![Page 20: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/20.jpg)
KCL-An Example•An R1 of 20 ohm , an R2 of 40ohm , and an R3 of 60ohm are connected in parallel across the 120-V power line. Using Kirchhoff’s current law, determine the total current It
![Page 21: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/21.jpg)
KCL-An Example
![Page 22: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/22.jpg)
Capacitors• Definition: A capacitor is an electronic device that stores
an electrical charge between the two plates• A basic capacitor has two parallel plates separated by an
insulating material• The unit of capacitance is Farads (F)• Capacitance values are normally smaller, such as µF, nF
or pF
![Page 23: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/23.jpg)
Different Types Of Capacitors
![Page 24: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/24.jpg)
Reading Values of capacitance Of Capacitors
![Page 25: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/25.jpg)
Storing a charge between the plates
• Electrons on the left plate are attracted toward the positive terminal of the voltage source
• This leaves an excess of positively charged holes
• The electrons are pushed toward the right plate
• Excess electrons leave a negative charge + -
+ _+ _
Working Of Capacitors
![Page 26: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/26.jpg)
Working Of Capacitors
![Page 27: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/27.jpg)
What is dielectric?
![Page 28: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/28.jpg)
The Farad Unit of Capacitance
• With more charging voltage, the electric field is stronger and more charge is stored in the dielectric.
• The amount of charge Q stored in the capacitance is therefore proportional to the applied voltage. Also, a larger capacitance can store more charge. These relations are summarized by the formula:
Q =CV coulombs
![Page 29: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/29.jpg)
Example•How much charge is stored in a 2uF capacitor connected across a 50-V supply?
Q =CV =(2u)x50=100 uC
•A constant current of 2 uA charges a capacitor for 20 s. How much charge is stored?
Q =Ixt=2u x 2=40 C
![Page 30: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/30.jpg)
Some Properties Of Capacitor
• Allow AC current to pass.• Stop DC current.• Stores Voltage in the form of electric field.• Capacitors in series:
1/Ct=1/C1+1/C2...• Capacitor In Parallel:
Ct=C1+C2+C3...
![Page 31: Resistors Capacitors](https://reader036.fdocuments.net/reader036/viewer/2022082216/5695d21e1a28ab9b029929ad/html5/thumbnails/31.jpg)