In AC circuit the emf (e) and the current (i) at any instant are given respectively by

e=Eo sin ωt

i=Iosin (ωt-ϕ)

The average power in the circuit over one cycle of AC is 

(a)EoIo2

(b) EoIo2sin ϕ

(c) EoIo2cos ϕ

(d) EoIo

 

Concept Questions :-

Different types of AC Circuits
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Power dissipated in an L-C-R series circuit connected to an AC source of emf ε is 

(a) ε2RR2+Lω-1Cω2

(b) ε2R2+Lω-1Cω2R

(c) ε2R2+Lω-1Cω2R

(d) ε2RR2+Lω-1Cω2

Concept Questions :-

Different types of AC Circuits
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In the given circuit the reading of voltmeter V1 and V2 are 300V each. The reading to the voltmeter V3 and ammeter A are respectively :

(a) 150V, 2.2A                                              (b) 220V, 2.2A

(c) 220V, 2.0A                                              (d) 100V, 2.0A

Concept Questions :-

Different types of AC Circuits
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A coil has resistance 30 Ω and inductive reactance 20 Ω at 50 Hz frequency. If an AC source of 200 V, 100 Hz, is connected across the coil, the current in the coil will be:

 1. 4.0 A                                           

 2. 8.0 A

 3. 2013A                                         

 4. 2.0 A

Concept Questions :-

Different types of AC Circuits
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The rms value of potential difference V shown in the figure is

                        

(a) Vo                                                     (b) Vo2

(c)Vo2                                                     (d) Vo3   

Concept Questions :-

Rms and average values
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An AC voltage is applied to a resistance R and an inductor L in series. If R and the inductive reactance are both equal to 3Ω, the phase difference between the applied voltage and the current in the circuit is

(a) π/4                                                 (b) π/2

(c) zero                                                  (d) π/6

Concept Questions :-

Different types of AC Circuits
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In an AC circuit an alternating voltage e=200 2 sin 100t volt is connected to a capacitor 1 μF. The rms value of the current in the circuit is

(a) 100 mA

(b) 200 mA

(c) 20 mA

(d) 10 mA

Concept Questions :-

Different types of AC Circuits
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In a coil of resistance 10Ω, the induced

current developed by changing magnetic

flux through it is shown in the figure as a 

function of time. The magnitude of change

in flux through the coil in weber is-

(a) 8

(b) 2

(c)6

(d)4

Concept Questions :-

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The instantaneous values of alternating

current and voltages in a circuit are given

as 

i=12sin(100πt) amperee=12sin(100πt+π/3) volt

The average power in Watts consumed in the

circuit is

(a) 14

(b) 34

(c) 12 

(d) 18

Concept Questions :-

Different types of AC Circuits
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In an electrical circuit R, L, C, and an AC voltage source are all connected in series. When L is removed from the circuit, the phase difference between the voltage and the current in the circuit is π/3. If instead, C is removed from the circuit, the phase difference is again π/3. The power factor of the circuit is

(a) 1/2                                           

(b) 1/2

(c) 1                                             

(d) 3/2

Concept Questions :-

Different types of AC Circuits
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Difficulty Level: