1. 1 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 oo VmVm v(t)  t v(t) = sin(  t + ) oo ? ? v(t) = cos(  t + ) ? ?

2. 2 AC circuit analysis deals with phasors and impedances 2 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  90 o ) 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 Revision

3. 3 Z = R + jX Revision

4. 4 Reactance Resistance Revision Impedance Pure resistor: Z = R Pure capacitor: Z = Pure inductor: Z = Im Re Im Re Im Re

5. 5 Z = R + jX Reactance Resistance Revision Impedance Inductive impedance: Z = R + jX Capacitive impedance: Z = R - jX R X |Z| R -X |Z|

6. 6 You must know how to draw phasor diagrams 3 I 1 = 5  -60 o A V 1 = 20  30 o V V 2 = 10  120 o V Revision 30 o V1V1 120 o -60 o V2V2 I1I1

7. 7 Perform nodal and mesh analysis in frequency domain 4 Revision Steps involved are exactly similar to DC anaysis However in AC, we deal with complex numbers

8. 8 Do you know CIVIL ? 5 Revision For Capacitor,C, I leads V by 90 degrees For Inductor, L, V leads I by 90 degrees