# lecture-18-ch31-alternating-current.pdf -...

• 10

This preview shows page 1 - 3 out of 10 pages.

StuDocu is not sponsored or endorsed by any college or universityLecture 18-ch31 - ALTERNATING CURRENTGeneral Physics II (香港科技大學)StuDocu is not sponsored or endorsed by any college or universityLecture 18-ch31 - ALTERNATING CURRENTGeneral Physics II (香港科技大學)Downloaded by James Cheung ([email protected])lOMoARcPSD|9287964
PHYS1114 Lecture 18 Alternating CurrentP. 1CH31ALTERNATINGCURRENTIntended Learning Outcomes – after this lecture you will learn:1.To use phasor diagrams to analyze ac circuits2.The response of resistor, inductor and capacitor in an ac circuit3.Power delivery and resonance in anL-R-CcircuitExcluding Session 31.6 Transformers, which you have learned in high school if you have takenHKDSE 1x PhysicsAn alternating current (ac) sourceprovides a sinusoidalvoltage?=?cos??Convention: lower case?is theinstantaneousvalue, whileupper case?is the maximum valueIn HK and most of the world,?= 50 Hz, i.e.,?= 2??=314 /s, whereas in North America,?= 60 HzPeriodof the signal is?= 1?= 2?/?Phasor diagram– represent a sinusoidal signal (e.g.?=?cos??) as a rotating vector in a 2D plane. The projection onthe?axis gives the signalAdvantage:while adding multiple signalsof the same frequency, usevector addition and then project to?axis to get the finalanswer.Avoid drawing multiple sinusoidal graphs.

Course Hero member to access this document

Course Hero member to access this document

End of preview. Want to read all 10 pages?

Course Hero member to access this document

Term
Fall
Professor
N/A
Tags
cos, James Cheung