Download presentation

Presentation is loading. Please wait.

Published byGuadalupe Colgrove Modified over 2 years ago

1
Basic Electronics Ninth Edition Basic Electronics Ninth Edition ©2002 The McGraw-Hill Companies Grob Schultz

2
Basic Electronics Ninth Edition Basic Electronics Ninth Edition ©2003 The McGraw-Hill Companies 19 CHAPTER Capacitive Circuits

3
Topics Covered in Chapter 19 X C and R in Series Sine-Wave V C Lags I C by 90 RC Phase-Shifter Circuit X C and R in Parallel

4
Topics Covered in Chapter 19 (continued) Sine-Wave I C Leads V C by 90 RF and AF Coupling Capacitors Capacitive Voltage Dividers The General Case of Capacitive Current I C

5
RC Voltage and Current Series Circuit The sine-wave ac voltage across a capacitor lags the capacitor’s charge and discharge currents by 90°. The sine-wave ac voltage across a resistor is always in phase with its current. The total sine-wave ac voltage for a series RC circuit always lags the total current by an angle between 0° and 90°.

6
VRVR I Waveforms and Phasors for a Series RC Circuit I I VCVC Note: since current is constant in a series circuit, the current waveforms and current phasors are shown in the reference positions.

7
Source Voltage and Current Phasors I Note: the source voltage lags the current by an amount proportional to the ratio of capacitive reactance to resistance. VSVS I VSVS X C < R I VSVS X C = R I VSVS X C > R

8
Phasors for Series RC Circuits VRVR VCVC VTVT Voltage Phasors R XCXC ZTZT Impedance Phasor

9
I = 2 A The Impedance of a Series RC Circuit V S = 100 R = 30 X C = 40 504030 2 2 2 2 C X R Z R XCXC The impedance is the total opposition to current flow. It’s the phasor sum of resistance and reactance in a series circuit A Z V I S 2 50 100 Z

10
The Tangent Function opposite adjacent negative angle opposite adjacent positive angle

11
I = 2 A The Phase Angle of a Series RC Circuit V S = 100 R = 30 X C = 40 30 40 50 53 30 40 11 Tan R X C V S lags I by 53° I VCVC VSVS -53°

12
KVL in a Series RC Circuit I = 2 A V S = 100 R = 30 X C = 40 60 V 80 V 100 V V R = IR = 2 x 30 = 60 V V C = IX C = 2 x 40 = 80 V VV S 1008060 22

13
RC Voltage and Current Parallel Circuit The sine-wave ac charge and discharge currents for a capacitor lead the capacitor voltage by 90°. The sine-wave ac voltage across a resistor is always in phase with its current. The total sine-wave ac current for a parallel RC circuit always leads the applied voltage by an angle between 0° and 90°.

14
Current Phasors for Parallel RC Circuits IRIR ICIC ITIT Current Phasors

15
Currents in a Parallel RC Circuit V S = 120 R = 30 X C = 40 IRIR ICIC I T = 5 A ITIT A R V I S R 4 30 120 A X V I C S C 3 40 120 AIII CRT 534 22 22

16
Phase Angle in a Parallel RC Circuit V S = 120 R = 30 X C = 40 I T = 5 A 4 A 3 A5 A 37 4 3 11 Tan I I R C The total current leads the source voltage by 37°.

17
Impedance in a Parallel RC Circuit V S = 120 R = 30 X C = 40 I T = 5 A 4 A 3 A5 A 24 5 120 T S EQ I V Z

18
Summary of R, X C and Z Resistance (R) in Ohms, Voltage in phase with current. Capacitive Reactance (X C ) in Ohms, Voltage lags current by 90°.

19
Summary of R, X C and Z (continued) Series circuit impedance (Z T ) in Ohms, Voltage lags current. Becomes more resistive with increasing f. Becomes more capacitive with decreasing f.

20
Summary of R, X C and Z (continued) Parallel circuit impedance (Z EQ ) in Ohms, Voltage lags current. Becomes more capacitive with increasing f. Becomes more resistive with decreasing f.

21
Summary of Formulas Series RCParallel RC 22 CRT III T S EQ I V Z R C I I Tan fC X C 2 1 22 CRT VVV 2 2 CT XRZ R X Tan C fC X C 2 1

Similar presentations

Presentation is loading. Please wait....

OK

Series and Parallel AC Circuits

Series and Parallel AC Circuits

© 2018 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on operation research introduction Free download ppt on surface chemistry Ppt on seven segment display common Ppt on anorexia nervosa Ppt on steps of humility Ppt on fdi in india 2013 Ppt on model view controller jsp Ppt on history of facebook A ppt on golden ratio Ppt on fibonacci sequence