EASY
12th ICSE
IMPORTANT
Earn 100

Distinguish between resistance, reactance and impedance for an AC circuit.

Important Questions on Alternating Current

EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 12
When a series L-C-R AC circuit is brought into resonance, the current has a large value. Why?
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 13
An AC circuit with resistance R. inductance I. and capacitance C are connected in series. The value of C is adjusted for resonance. State any three properties of this circuit which hold true for resonance only. (Give the properties in words or equations relating XL>Xc, Z, R, ϕ, power, etc.)
MEDIUM
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 14
What is the ‘power factor* of an L-C-R circuit? What are its maximum and minimum values and under what conditions? 
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 15
What is the power factor of an L-C-R circuit at resonance?
MEDIUM
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 16
An ideal inductor in an AC circuit consumes no power, though both V and I are non-zero. Why?
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 17
Prove that an ideal capacitor connected to an AC source does not dissipate power.
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 18
Can a capacitor of suitable capacitance replace a choke coil in an AC circuit?
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 19
What is main advantage of AC over DC due to which AC is used?