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Unformatted text preview: 11AC Circuits and Network Theorems Deakin University @ 2000 Ref: 12AC_Circuits.doc Lecturer:Richard Bisinella (Bach. Elec. Eng. Melb) Room:SC722Phone:(03) 5227 1426 Email:[email protected] Hours: Need Help:Visit me during office hours or Email me a question, best to email me to book an appointment out of my contact hours.Acknowledgements:Dr John Long Part A:AC Circuits and Network Theorems Part B:Electronic Devices+12AC Circuits and Network Theorems Deakin University @ 2000 Ref: 12AC_Circuits.doc ELECTROMAGNETIC INDUCTION & AC CIRCUITSTOPIC 1 LECTURE PART A 1.1 AC Signals & InductorsAims•Understand alternating current signals •Understand the basics of electromagnetic induction•Understanding transformers •Understanding Inductors & Capacitors •Giancoli 1995, pp 515518 Where are AC Signals?•Power Point (240V  50Hz)•Power Amplifiers / Audio Amplifiers•Radios•Car Ignition systems•Speakers •Everywhere13AC Circuits and Network Theorems Deakin University @ 2000 Ref: 12AC_Circuits.doc Why do our power points have AC & not DC?Reasons for AC transmittion system: •Voltages can easily be increased and decreased via power transformers •The invention of electric generator in the 1880s completed the ac system of power production, which at the time was in competition with the DC system of Mr Edison. •The concept of AC generation was the idea the engineer Nikola Tesla. 14AC Circuits and Network Theorems Deakin University @ 2000 Ref: 12AC_Circuits.doc Discharge of several million volts cascading around Tesla in Colorado Springs Laboratory. The roar that accompanied such discharges could be heard 10 miles away.11Tesla Man Out Of Time, Margaret Cheney,Dell Publishing, P136137Figure 1.1.2 The above picture was fabricateby Tesla to gain investment. (Using a standarcamera & double exposure) 15AC Circuits and Network Theorems Deakin University @ 2000 Ref: 12AC_Circuits.doc Alternating Current SignalsBasic function: a = Instantaneous value of the function at time t A = The Amplitude ϖ= the angular frequency in radians per second t = time φ= the phase angle in radians Figure 1.1.3 Simple Cosine wave with φ= 0°a = Acos(ϖt)  T/2 0 T/2 T t(s) (rads)2t (rads)A1 Period(1 Period from 0 to 2π) (This is a simple cosine wave))cos(fw+=tAa16AC Circuits and Network Theorems Deakin University @ 2000 Ref: 12AC_Circuits.doc Figure 1.1.4 Simple Cosine wave with φ= 45°a=Acos(ϖt+π/4) T/2 0 T/2 T t(s) (rads)2t (rads)Aa1 Period(By increasing φ(sie) we move the cosine wave to our left) 17AC Circuits and Network Theorems Deakin University @ 2000 Ref: 12AC_Circuits.doc If φ= +π/2, a = Acos(ϖt +π/2) = Asin(ϖt) Figure 1.1.5 Simple sine wave & Cosine with φ= +π/2 T/2 0 T/2 T t(s) (rads)2t (rads)aThe phase angledetermines where the wave crossesthe yaxisand is am important parameter in electronic networks, which contain reactivecomponents(EG inductors & capacitors) 18AC Circuits and Network Theorems Deakin University @ 2000...
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 Spring '08
 Trinh
 Alternating Current, Network theorems, Inductor

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