Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Previous Year Questions)>Q 21

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In an ac circuit, voltage $V = V_{0} \sin ω t$ and inductor $L$ is connected across the circuit. The instantaneous power will be

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Important Questions on Alternating Current

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Previous Year Questions)>Q 22

In a given series LCR circuit

R = 4 Ω, X_{L} = 5 Ω

and

X_{C} = 8 Ω,

the current

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Previous Year Questions)>Q 24

A coil of self-inductance

L

is connected in series with a bulb

B

and an

A C

source. Brightness of the bulb decreases when

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Previous Year Questions)>Q 26

Consider following series R-L-C circuit.

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The maximum voltage drop across inductance is :-

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Previous Year Questions)>Q 27

An electrical device operate at

12 A

current and

120 V D C

. If it is connected with

250 V

and

30 Hz A C

. Then power consumption :-

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Previous Year Questions)>Q 28

A series R-C circuit is connected to an alternating voltage source. Consider two situations :-
(a) When capacitor is air filled.
(b) When capacitor is mica filled.
Current through resistor is i and voltage across capacitor is V then :-

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Previous Year Questions)>Q 29

A resistance

R

draws power

P

when connected to an

AC

source. If an inductance is now placed in series with the resistance, such that the impedance of the circuit becomes

Z

, the power drawn will be:

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Previous Year Questions)>Q 30

What is the frequency of power in an

A C

circuit connected to a capacitor. Given

f = 50 Hz, V = 220 volt

.

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Previous Year Questions)>Q 31

In the given circuit the potential difference across resistance is $54 V$ and power consumed by it is $16 W$ . If $A C$ frequency is $60 Hz$ find the value of $L$ :
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