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The rms value of voltage of the waveform shown below is, vrms=k3 V, find the value of k.

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Important Questions on Alternating Current

EASY
An alternating current is given by the equation i=i1sinωt+i2cosωt. The rms current will be:
EASY
An AC source is rated at 220 V, 50 Hz. The time taken for voltage to change from its peak value to zero is
EASY
The mean or average value of AC over a complete cycle is
EASY
For an AC given by I=50cos100t+45° A. The value of Irms= _________ A.
MEDIUM
A 40 μF capacitor is connected to a 200 V, 50 Hz AC supply. The rms value of the current in the circuit is, nearly:
EASY
An AC source rated 220 V,50 Hz is connected to a resistor. The time taken by the current to change from its maximum to the rms value is :
EASY

The rms value of potential difference V0 shown in figure is

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EASY
If the mains voltage is 230 V, then the peak voltage approximately is
EASY

In the given circuit the peak voltages across C, L and R are 30 V, 110 V and 60 V respectively. The rms value of the applied voltage is

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EASY
The peak current through a 200 mH inductor connected to an AC source of peak value 210 V and frequency 50 Hz is ___.
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An A.C. voltage V=5cos(1000t) V is applied to a L-R series circuit of inductance 3 mH and resistance 4 Ω. The value of maximum current in the circuit is _____ A.
MEDIUM

An alternating voltage is given by E=100sinωt+π6 V. The voltage will be maximum for the first time when time is (T= time period)

MEDIUM
A pure inductor of inductance 0.1 H is connected to an AC source (of rms voltage) 220 V angular frequency of 300 Hz. The rms current is
EASY
An AC current is given by I=I1sinωt+I2cosωt.
A hot wire ammeter will give a reading:
HARD
A 10 Ω resistance is connected across 220 V-50 Hz AC supply. The time taken by the current to change from its maximum value to the rms value is:
EASY

Alternating Current cannot be used for which of the following ?

MEDIUM

The alternating current is given by, i=42sin2πTt+10 A. The R.M.S. value of this current is __________ A.

EASY

In the circuit shown below, if Vs=Vmsinωt and the diode is ideal, the average value of voltage across RL is (Assume source resistance is zero)

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EASY
The frequency of an alternating current is 50 Hz. What is the minimum time taken by current to reach its peak value from zero value?
EASY
The AC voltage across a resistance can be measured using a: