EASY
12th ICSE
IMPORTANT
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What is capacitive reactance Xc? What is its value for DC?

Important Questions on Alternating Current

EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 11
Distinguish between resistance, reactance and impedance for an AC circuit.
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?