* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Revision AC
Survey
Document related concepts
Resistive opto-isolator wikipedia , lookup
Operational amplifier wikipedia , lookup
Distributed element filter wikipedia , lookup
Crystal radio wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Rectiverter wikipedia , lookup
Valve RF amplifier wikipedia , lookup
RLC circuit wikipedia , lookup
Mathematics of radio engineering wikipedia , lookup
Antenna tuner wikipedia , lookup
Network analysis (electrical circuits) wikipedia , lookup
Standing wave ratio wikipedia , lookup
Transcript
REVISION Things you should know Things you have learned in SEE1003 Things I EXPECT you to know ! 1 Knows how to write expressions for sinusoidal waveforms v(t) = ? sin(t + v(t) Vm ?) v(t) = ? cos(t + ? ) o t o 1 Revision 2 AC circuit analysis deals with phasors and impedances Phasors: A complex number containing information on magnitude and phase of a sinusoidal voltage or current A cos (t o) A o A sin (t o) A (o 90o) Impedance: A ratio between voltage and current phasors – it is a complex number but NOT a phasor Z = R + jX You MUST know how to deal with complex number 2 Revision Z = R + jX 3 Revision Z = R + jX Impedance Reactance Resistance Im Pure resistor: Z = R Re Im Re 1 1 j Pure capacitor: Z = C jC Pure inductor: Z = jL Im Re 4 Revision Z = R + jX Impedance Reactance Resistance Inductive impedance: Z = R + jX |Z| X R R Capacitive impedance: Z = R - jX -X |Z| 5 Revision 3 You must know how to draw phasor diagrams V1 V2 V1 = 2030o V V2 = 10120o V I1 = 5-60o A 120o 30o -60o I1 6 Revision 4 Perform nodal and mesh analysis in frequency domain Steps involved are exactly similar to DC anaysis However in AC, we deal with complex numbers 7 Revision 5 Do you know CIVIL ? For Capacitor,C, I leads V by 90 degrees For Inductor, L, V leads I by 90 degrees 8