EASY
12th ICSE
IMPORTANT
Earn 100

 The equation V = V0 sin ωt  represents alternating emf. Write the values of its amplitude, frequency and time-period. 

Important Questions on Alternating Current

EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 3
Alternating current flowing through a certain electrical device leads over the potential difference across it by 90°. State whether this device is a resistor, capacitor or an inductor.    
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 4
What is impedance of an AC circuit?
 
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 5
The impedance of an AC circuit is a complex quantity. What information is provided by its real and imaginary parts?
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 6
A coil of resistance R and self-inductance L is connected to an AC source of frequency f. What is its impedance?
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 8
An ideal inductor does not consume any power even though both V and I  are non-zero. Explain in brief. Further in a pure inductor voltage leads current by a phase angle of 90° thus average power,
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 9
Can an L-C-R AC circuit be made purely resistive? How?
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 10
Express quality factor Q in terms of L, C and R. What does it signify?
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 11
Give the expression for the power factor in an L-R  circuit in terms of the resistance R and the inductive reactance XL.