Page 270 - Basic Electrical Engineering

3

AC Fundamentals and Single-phase Circuits

TOPICS DISCUSSED

Concept of dc and ac
Concept of frequency
Time period
Instantaneous value
Average value and maximum value of an alternating quantity
Sinusoidal and non-sinusoidal wave forms
Concept of root mean square value
Concept of phase and phase difference
Single-phase ac circuits
Series–parallel circuit containing resistance inductance and capacitance
Concept of apparent power
Real power and reactive power
Resonance in ac circuits
Solution of ac circuit problems

3.1 AC FUNDAMENTALS

Now days electricity is generated in the form of ac (alternating current). The
generated electricity is transmitted, distributed, and mostly utilized in the

form of ac. In this chapter, the fundamental concepts of ac and ac circuits
have been discussed.

3.1.1 Introduction