Topics:

AC A current that changes direction periodically.

R.M.S value of Sinusoidal Current The effective value of a sinusoidal current.

Phase of AC The relationship between the voltage and current in AC.

AC through Resistor Behavior of AC passing through a resistor.

AC through Inductor Behavior of AC passing through an inductor.

AC through Capacitor Behavior of AC passing through a capacitor.

RL Series AC Circuit The response of an RL circuit to AC.

RC Series AC Circuit The response of an RC circuit to AC.

RLC Series AC Circuit The response of an RLC circuit to AC.

RLC Series Resonance The resonance phenomenon in an RLC circuit.

Principle of Metal Detectors How metal detectors work using AC principles.

Maximum Power Transfer The condition for maximum power transfer in circuits.

Maxwell Equations A set of equations that describe electromagnetism.

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Exercise:

Go to Alternating Current Exercise Practice what you've learned in the Alternating Current chapter by completing the exercises.

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Chapter Introduction:

This chapter introduces alternating current (AC) and its key properties such as phase, frequency, and the relationship between voltage and current in AC circuits. Topics covered include the behavior of AC in resistors, inductors, and capacitors, as well as the analysis of RL, RC, and RLC circuits. The chapter also touches on real-world applications, including metal detectors and the maximum power transfer theorem, and concludes with a discussion of Maxwell’s equations, which form the basis for electromagnetism.

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Key Concepts

• Alternating Current
  A current that periodically reverses direction, commonly used in power systems.

• R.M.S value of Sinusoidal Current
  The effective value of sinusoidal current, important for calculating power.

• Phase of AC
  Describes the relationship between the voltage and current waveforms in AC circuits.

• AC through Resistor
  The current through a resistor when subjected to alternating voltage, following Ohm’s law.

• AC through Inductor
  The behavior of current passing through an inductor in AC circuits, involving inductive reactance.

• AC through Capacitor
  The behavior of current passing through a capacitor in AC circuits, involving capacitive reactance.

• RL Series AC Circuit
  A circuit containing both a resistor and an inductor, with combined reactance.

• RC Series AC Circuit
  A circuit containing both a resistor and a capacitor, with combined reactance.

• RLC Series AC Circuit
  A circuit containing a resistor, inductor, and capacitor, exhibiting resonance.

• RLC Series Resonance
  Occurs when the inductive and capacitive reactances cancel each other out at a specific frequency.

• Principle of Metal Detectors
  Metal detectors use the principles of electromagnetic induction to detect metallic objects.

• Maximum Power Transfer
  A condition where the load resistance equals the source resistance for maximum power delivery.

• Maxwell Equations
  A set of four equations that form the foundation of electromagnetism.

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