Alternating Current Questions

In the given circuit the reading of voltmeter V1 and V2 are 300 volts each. The reading of the voltmeter V3 and ammeter A are respectively...

An inductor and a resister in series are connected to an A.C. supply of variable frequency. As the frequency of the soure is increased, the phase angle between current and the potential difference acr...

An alternating EMF of frequency is applied to a series LCR circuit. For this frequency of the applied EMF,...

The instantaneous values of alternating current and voltages in a circuit are given as sin(100πt) ampere sin(100πt + ) voltThe average power in Watts consumed in the circuit is...

The current (I) in the inductance is varying with timeaccording to the plot shown in figure. Which one of thefollowing is the correct variation of voltage with time in thecoil?...

In an electrical circuit R, L, C and an a.c 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 &...

The r.m.s value of potential difference V shown in the figure is

A coil has resistance 30Ω and inductive resistance 20Ω at 50 Hz frequency. If an ac source, of 200 volt, 100 Hz, is connected across the coil, the current in the coil will be...

An ac voltage is applied to 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 th...

In an AC circuit an alternating voltage e = 200√2 sin 100 t volts is connected to a capacitorof capicity 1μ F . The r.m.s value of the current in the circuit is...

In a series LCR circuit R = 200 Ω and the voltage and the frequency of the main supply is 220 V and 50 Hz respectively. On taking out the capacitance from the circuit the current lags behind the ...

An AC voltage source of variable angular frequency ω and fixed amplitude V0 is connected in series with a capacitance C and an electric bulb of resistance R (inductance zero). When ωis incre...

A coil of inductance 8.4 mH and resistance 6Ω is connected to 12 V battery. The current in the coil is 1 A at approximately the time

AS shown in the figure, P and Q are two coaxil conducting loops separated by some distance. When the switch S is closed, a clockwise current Ip flows in P (as seen by E) and an induced current IQ1 flo...

A shorticircuited coil is placed in a time verying magnetic field. Electric power is disspated due to the current induced in the coul. If the number of turns were to be quadrupled (four times) and the...

In an a.c. circuit the voltage applied is E = E0 sin ωt. The resulting current in the circuit is I = I0 sin . The power consumption in the circuit is given by...

An ideal coil of 10H is connected in series with a resistance of 5Ω and a battery of 5V. 2 second after the connection is made the current flowing in amperes in the circuit is...

The phase difference between the alternating current and emf is π/2. Which of the following cannot be the constituent of the circuit?

In an LCR series a.c. circuit, the voltage across each of the components, L, C and R is 50 V. The voltage across the LC combination will be

The power factor of an AC circuit having resistance (R) and inductance (L) connected in series and an angular velocity ω is