MEDIUM
12th Uttar Pradesh Board
IMPORTANT
Earn 100

An alternating voltage

V = 30 sin 50t + 40 cos 50t

is applied to a resistor of resistance 1 0 Ω . The rms value of current through resistor is

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Important Questions on Alternating Current

EASY
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Alternating Current>Exercise>Q 33
Find the frequency of voltage for an AC circuit. The equation of alternating voltage is V=200sin314t.
MEDIUM
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Alternating Current>Exercise>Q 34
An A.C. circuit consist of a resistance and a choke in series. The resistance is of 2 2 0 Ω and choke is of 0.7 henry. Find the power absorbed from 220 volts and 50 Hz, source connected with the circuit.
EASY
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Alternating Current>Exercise>Q 35

The value of alternating emf E in the given circuit will be
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HARD
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Alternating Current>Exercise>Q 36
A circuit containing an 80 mH inductor and a 250 μF capacitor in series is connected to a 240 V,100 rad/s supply. The resistance of the circuit is negligible.
(i) Obtain rms value of current.
(ii) What is the total average power consumed by the circuit?
HARD
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Alternating Current>Exercise>Q 37

An a.c. circuit has a resistance and an inductance connected in series as shown in figure. Calculate the current and the power factor in the circuit.

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HARD
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Alternating Current>Exercise>Q 38

Calculate the current and power factor of the circuit shown in figure.

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MEDIUM
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Alternating Current>Exercise>Q 39
A group of electric bulbs has a power rating of 300W. An a.c. voltage, V=141.4sin(314t+π/3) is applied to the group. Calculate the effective current.
HARD
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Alternating Current>Exercise>Q 40
A circuit containing a 80mH inductor and a 60μF capacitor in series is connected to a 230V, 50Hz supply. If the circuit has a resistance of 15Ω, obtain the average power transferred to each element of the circuit and the total power absorbed.