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12th Uttar Pradesh Board
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What is bandwidth? Write its expression for L-C-R series circuit.

Important Questions on Alternating Current

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12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Alternating Current>Exercise>Q 10
What do you mean by resonant circuit. Give the required condition for series L-C-R resonant circuit derive the expression for its resonance frequency. Where this circuit is used?
EASY
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Alternating Current>Exercise>Q 11
An A.C. is represented by e = 220 sin 1 0 0 π t volt and is applied over a resistance of 110 ohm. Calculate the heat produced in 7 minutes
MEDIUM
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Alternating Current>Exercise>Q 12
In an AC circuit the emf (e) and the current (i) at any instant are given respectively by, E=E0sinωt and I=I0sinωt-ϕ. The average power in the circuit over one cycle of AC is,
EASY
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Alternating Current>Exercise>Q 13
If E0 is the peak emf, I0 is the peak current and ϕ is the phase difference between them, then the average power dissipation in the circuit is
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12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Alternating Current>Exercise>Q 14
In an AC circuit the voltage applied is E=E0sin⁡ωt. The resulting current in the circuit is I=I0sin⁡ωt-π2. The power consumption in the circuit is given by
EASY
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Alternating Current>Exercise>Q 15
The average power generated in an inductor connected to an AC source is
HARD
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Alternating Current>Exercise>Q 16
A  LCR circuit with resistors, capacitors and inductors connected in series have the following values R=20 Ω, L=1.5 H and C=35 μF. This combination of LCR series circuit has been connected to a variable frequency and a supply voltage of 200 V ac supply. Calculate the average power that is transferred to the above connection in the entire cycle, when the supply frequency and the natural frequency are equal.
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12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Alternating Current>Exercise>Q 17
A circuit containing a 80 mH inductor and a 60 μF capacitor, in series is connected to a 230 V, 50 Hz. The resistance of the circuit is negligible. What is the average power transferred to the inductor?