Course Description

Alternating current is defined as an electric current that periodically reverses direction while varying in magnitude over time. This is fundamentally different from direct current, which flows in only one direction with relatively constant magnitude. The primary advantage of AC over DC lies in voltage transformation. Using transformers, AC voltage can be stepped up for transmission and stepped down for safe distribution. This capability drastically reduces transmission losses. Most countries, including Pakistan, operate at 50 Hz, while countries such as the United States operate at 60 Hz. The frequency standardization is critical for synchronization across the grid. Even minor frequency deviations can indicate instability between generation and load demand. AC power is generated using alternators, where mechanical energy-typically from turbines-is converted into electrical energy through electromagnetic induction.

What you'll learn in this course?

• Explain the fundamental principles of alternating current (AC).

• Describe sinusoidal waveforms and their key parameters.

• Define RMS, peak, average values and their significance.

• Understand single-phase and three-phase power systems.

• Analyze basic AC circuits involving resistance, inductance, and capacitance.

• Interpret power concepts including real, reactive, and apparent power.

• Understand power factor and its practical importance in power systems.

Prerequisites

• Basic understanding of voltage, current, resistance, and Ohm's Law

• Familiarity with elementary electrical circuit calculations is helpful