EASY
12th ICSE
IMPORTANT
Earn 100

Prove that an ideal inductor does not dissipate power in an AC circuit.

Important Questions on Alternating Current

HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 20
Explain the principle, construction and working of a choke coil in controlling current in an AC circuit. Why is it preferred to resistance in AC circuits?
HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 21
Discuss the phenomenon of resonance in an L-C-R series AC circuit.
HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 22
Obtain an expression for resonant frequency f0 of a series L-C-R circuit.
MEDIUM
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 23
In series L-C-R circuit, obtain an expression for the resonant frequency.
MEDIUM
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 1

Define peak value of an alternating current, average value for half-cycle, root-mean-square value of AC and obtain the relation.

Irms=I02

MEDIUM
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 2
What do you understand by same phase or in phase, leading and lagging in the context of AC voltage and current? Draw corresponding phasor diagram for leading and lagging.
HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 3
Define inductive reactance and capacitive reactance, write their units and plot a graph for XL and XC with frequency of an alternating current.
MEDIUM
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 4
What do you understand with impedance? Write its unit and obtain relation for it in L-C-R circuit.