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Intro To Elec & Computer Engr

by: Karolann Wiegand

Intro To Elec & Computer Engr ECE 1100

Karolann Wiegand
GPA 3.51

Ji Chen

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Ji Chen
Class Notes
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This 32 page Class Notes was uploaded by Karolann Wiegand on Saturday September 19, 2015. The Class Notes belongs to ECE 1100 at University of Houston taught by Ji Chen in Fall. Since its upload, it has received 5 views. For similar materials see /class/208295/ece-1100-university-of-houston in Electrical Engineering at University of Houston.

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Date Created: 09/19/15
ECE 1100 Introduction to Electrical and Computer Engineering Fall 2008 Professor Ji Chen David R Jackson ECE Dept Notes 19 Resistors Resistors Example 47Kor 4700 ohms Carbon Isl 2nd 3m an 5 u Re Drange Iellow Green Blue Violet Gray White Band I first J Band 2 secnd Band 3 multiplier with 39039 H H Ii H il Ii H il Ii wuuamawN Band 1 Yellow 4 Band 2 Violet 7 Ban 3 Red 2 Band 4 Enid 5 Tolerance 47ml Dhms Band 5 a 6 usually for 1 metal film types Band 6 fur temp coefficient Band 4 tol in Resistors cont Note passive sign convention is assumed here v R2 units ofR are Ohms Q Ohm s Law v l R x v There is a linear relationship between voltage and current That is the value ofR does not depend on the current going through it Example NA 109 NJ VRI10220 V V 2W 10p x V 2R 10 2 20 V Example cont 392 A 10 Q 39 VRI10 2 20 V V 392 A 10 Q gt m VRI10220 V 2 A gt V 2R 10 2 20 V Power Dissipation l39gt RQ V v 39 Note that passive sign convention is used here power formula Ohm s law Power Dissipation cont l39gt RQ w V 39 Example Note in the MKS system 12 V we must use V A Q W J Example vt 120J cos2n60t V 60 H AC I39 It v t R 144 Q 2 me vo age Pb I 2 v2 I 120 00527601 2000082 275601 a s R 144 Example cont R 144 Q v t T1f160s cos cot O l v v PM Tp T2 05 160 s Example cont P abs r 200 cos2 2760 W V 1 T17 05 160 1120 3 000833 3 T AVE P 1 abs 200005227c60tdt T OQB Example cont 1120 1 PafSVE 200 cos2 27c60tdt 1120 0 1120 200120 j 005227c60tdt 0 Note the average value of Note cos2 wt 12 12 cos2at 0082 wt is abs 1120 PAVE 200120 sm i20t TC 1120 2 200120T 100 Example cont v t 120xEcos 27c60t V 60 Hz AC line voltage R144Q What is this A 100 W light bulb Example cont Observation about average power vt120xEcos27c60t V R 144 Q Box5f 120v2 PailE i R 144 The value 120 V is called the effective or RMS Root Mean Square voltage The meaning of the term RMS will become Clear in later notes Example cont General Formula vt Acoscot V The RMS voltage is the peak voltage divided by 2 ECE 1100 Introduction to Electrical and Computer Engineering Fall 2008 Professor Ji Chen ECE Dept Notes 14 Crystal Radio Principles Crystal Radio Schematic Antenna Inductor Variable Capacitor Diode 1 N34A IF HighImpedance Earphone Ground Resonant Circuit Resonant frequency Inductor L Henrys Capacitor C Farads Adjusting C allows you to tune the circuit to respond to a given frequency This uses the principle of resonance Amplitude Modulation Field transmitted from transmit antenna I 7710 I lt 1 mt audio message signal voice MU Audio message signal Ex A High frequency signal 0 broadcast from antenna n A n t Your ear cannot hear suchasignal Detection The diode only allows current to flow in one direction sinusoidal signal from receive antenna diode O W a quotquot 7AI vltrgt t earphone V0 LowPass Filtering Peak of signal Average value of signal VA 2 proportional to the amplitude The total rectified signal red part consists of a sum of two parts 1 The average vAl 2 A highfrequency part that has a zero average value LowPass Filtering cont k m nmnn r MOM VHU t n nnn m t I I I l l gm HUM 2 W 7 x if L W r 7 LowPass Filtering cont Your ear cannot respond to the highfrequency signal it is beyond the frequency range of human hearing or the DC offset Human hearing range 20 Hz 20 kHz 1710 J Audio message signal F t i V v J Yquot7Lgt 7 ll 7 I V V ll H sysalnieajlli Iquot3llgllll exam ll Heath 3 ECE 1100 Introduction to Electrical and Computer Engineering Fall 2008 Professor Ji Chen ECE Dept v0 Notes 9 m m Sinusoidal Signals U U l Basic Facts Sinusoidal waveforms waves that vary sinusoidally in time are the most important types of waveforms encountered in physics and engineering gt Most natural sources of radiation the sun etc emit sinusoidal waveforms gt Most humanmade systems produce sinusoidal waveforms AC generators microwave oscillators etc gt Most communications is done via sinusoidal waveforms that have been modulated either in an analog fashion such as AM or FM or digitally General Sinusoidal Waveform V0 A amplitude of sinusoidal waveform a radian frequency of sinusoidal waveform radianss phase of sinusoidal signal radians Period of Sinusoidal Wave T 4 D v0 H mm 05 U 10 U 15 HS In this example T 05 Frequency of Sinusoidal Wave 1 S m 05 U 10 U 15 ris Units Hz cycles v0 In this examplef 2 Hz cycless 1 scycle Radian Frequency vt i T 5 t IUU 121 2 Acosat Since the cosine function repeats after 27r we have aT27z Radian Frequency cont or Summary


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