Representation of AC Current and Voltage by Rotating Vectors-phasors

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Representation of AC Current and Voltage by Rotating Vectors-phasors: Overview

This Topic covers sub-topics such as Phasor Diagram for Pure Resistance Circuit, Phasor Diagram in AC and, Phase Difference in Voltage and Current in Pure Resistance

Important Questions on Representation of AC Current and Voltage by Rotating Vectors-phasors

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Given below are two statements:
Statement-I: In an ac circuit, the current through a capacitor leads the voltage across it.
Statement-II: In a.c. circuits containing pure capacitance only, the phase difference between the current and the voltage is π In the light of the above statements, choose the most appropriate answer from the options given below:
 

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Given below are two statements:

Statement-I: In an ac circuit, the current through a capacitor leads the voltage across it.

Statement-II: In a.c. circuits containing pure capacitance only, the phase difference between the current and the voltage is π

In the light of the above statements, choose the most appropriate answer from the options given below:

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Select the correct phasor diagram of the circuit having only resistance.

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An A.C source supply voltage, E=200 sin314t is applied to a pure resistance circuit containing resistance 200 Ω. Calculate the peak value of current.

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If in ac circuit there is no leading or lagging between supplied voltage and current then ac circuit is named as

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In a certain circuit, E=200 cos(314 t) and I=sin(314 t+π/4). Their vector representation is

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In a circuit made up of resistance 4 Ω, and inductance 0.01 H, an alternating emf 200 V at 50 Hz is connected, then the phase difference between the current and the emf in the circuit is:

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200 Ω resistance and 1 H inductance are connected in series with an AC circuit. The frequency of the source is 2002π Hz. Then phase difference in between V and I will be :-

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In a certain circuit E=200cos314t and I=sin314t+π4, their vector representation is :-

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Two sinusoidal voltages of the same frequency are shown in the diagram. What is the frequency, and the phase relationship between the voltages

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Frequency in Hz Phase lead of N over M in radians
 

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In an A.C. circuit, the resistance of R Ω is connected in series with an inductance L. If the phase angle between voltage and current be 45°, the value of inductive reactance will be: 

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In series LCR circuit, the phase angle between supply voltage and current is

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Voltage and current in an AC circuit are given by V=5sin100 πt-π6 and I=4sin100πt+π6

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For the equation yt=5cmsin3πt+3cos3πt where t is in seconds, find amplitude and time period.

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In a series LCR circuit, the potential drop across L, C and R respectively are 40 V, 120 V and 60 V. Then, the source voltage is

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A coil of inductive reactance 1/Ω   and resistance Ω is connected to a 200 V, 50 Hz AC supply. The time lag between maximum voltage and current is

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In an A.C. circuit, the resistance R is connected in series with an inductor of self-inductance L. If phase angle between voltage and current be 45o , the value of inductive reactance XL will be equal to.....

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In an L.C.R. series a.c. circuit, the current

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The circuit given in figure has a resistanceless choke coil L and a resistance R. The voltage across R and L are given in figure. The virtual value of the applied voltage is


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In a series LCR circuit the rms voltages across the inductance, capacitance and resistance are respectively 4 V8 V and 5 V. The RMS voltage of the AC source in the circuit is