# CHAPTER 11

*AC Steady-State Power*

**IN HIS CHAPTER**

**11.1** Introduction

**11.2** Electric Power

**11.3** Instantaneous Power and Average Power

**11.4** Effective Value of a Periodic Waveform

**11.5** Complex Power

**11.6** Power Factor

**11.7** The Power Superposition Principle

**11.8** The Maximum Power Transfer Theorem

**11.9** Coupled Inductors

**11.10** The Ideal Transformer

**11.11** How Can We Check … ?

**11.12** **DESIGN EXAMPLE**— Maximum Power Transfer

**11.13** Summary

Problems

PSpice Problems

Design Problems

**11.1** *Introduction*

In this chapter, we continue our study of ac circuits. In particular, we will see the following:

- The power supplied or received by any element of an ac circuit can be conveniently calculated after representing the circuit in the frequency domain.
Power in ac circuits is an important topic. Engineers have developed an extensive vocabulary to describe power in an ac circuit. We'll encounter average power, real and reactive power, complex power, the power factor, rms values, and more.

- AC circuits that contain coupled inductors and/or ideal transformers can be conveniently analyzed in the frequency domain.
Both coupled inductors and ideal transformers consist of magnetically coupled coils. (Coils may be tightly coupled or loosely coupled. The coils of an ideal transformer are perfectly coupled.) After representing coupled inductors and transformers in the frequency domain, we will be able to analyze ac circuits ...