EASY
12th Punjab Board
IMPORTANT
Earn 100

Define resonant frequency of LCR series circuit.

Important Questions on Alternating Current

MEDIUM
12th Punjab Board
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 7 - Alternating Current>Punjab Board-2018>Q 2

A capacitor of unknown value and an inductor of 0.1 H and a resistor of 10Ω are connected in series to a 220 V, 50 Hzac source. It is found that the power factor of circuits is unity. Calculate the capacitance of capacitor and maximum amplitude of the current..

MEDIUM
12th Punjab Board
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 7 - Alternating Current>Punjab Board-2018>Q 3
With the help of labelled diagram, describe the principle, construction and working of a transformer.
EASY
12th Punjab Board
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 7 - Alternating Current>Punjab Board-2019>Q 4
A series L-C-R circuit with R=20 ohm, L=1.5 henri, and C= 35μF is connected to a variable frequency 200 V a.c.supply.When the frequency of the supply equals the natural frequency of the circuit, what is the average power transferred to the circuit in one complete cycle.