Study Chapter Details
UP Board Class 12 Physics – Alternating Current
“Alternating Current (AC)” is a highly important chapter in UP Board Class 12 Physics that explains the behavior of electric current that changes its magnitude and direction periodically. Students learn the basics of AC generation using alternators, which convert mechanical energy into electrical energy.
The chapter covers key terms such as instantaneous value, peak value, root mean square (RMS) value, and average value of AC. Understanding these quantities helps students analyze how AC behaves in different electrical circuits.
Students also study AC circuits containing resistors, inductors, and capacitors, individually and in combinations (RLC circuits). Concepts like capacitive reactance, inductive reactance, impedance, phasor diagrams, and power factor build a strong foundation for electrical engineering principles.
A major highlight of this chapter is resonance in RLC circuits, which explains how circuits achieve maximum current at a specific frequency. The chapter also introduces transformers, their types, energy losses, and applications in power transmission.
