Physics SSS3 First Term

WEEK 1

Simple A. C Circuit

Performance Objectives

Students should be able to;

1. Explain the peak and V.M.S of current and p.d
2. Establish the phase relationship between current in a.c circuit.
3. Explain reactance and impedance

Alternating Current

Content

A.C. circuits are circuits through which an alternating current flows. Such circuits are used extensively in power transmission, radio, telecommunication and medicine.

Alternating currents are produced by time dependent alternating voltages given by the relation E = E₀ sin ωt. Much of what we learned about d.c. circuits also apply to a.c. circuits. The effects on such voltages on resistors, capacitors and inductors will be discussed.