MEDIUM
12th ICSE
IMPORTANT
Earn 100

What do you understand by “wattless current? Why is the current passing in a choke coil wattless?

Important Questions on Alternating Current

MEDIUM
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 18
Obtain an expression for the power factor of an AC L-R circuit. Give the necessary condition for a wattless current in the circuit.
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 19
Prove that an ideal inductor does not dissipate power in an AC circuit.
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.