Physics-
General
Easy
Question
In an L–R series circuit, a sinusoidal voltage 
is applied. It is given that L = 35 mH, R = 11
, Vrms = 220 V, 
and 
= 22/7. Find the amplitude of current in the steady state and obtain the phase difference between the current and the voltage. Also plot the variation of current for one cycle on the given graph.
An AC voltage source of variable angular frequency 
and fixed amplitude V connected in series with a capacitance C and an electric bulb of resistance R (inductance zero). When is increased :
- the bulb glows dimmer
- the bulb glows brighter
- total impedence of the circuit is unchanged
- total impedence of the circuit increases
The correct answer is: the bulb glows brighter
when increases, irms increases so the bulb glows brighter
Related Questions to study
physics-
When an AC source of emf 
is connected across a circuit, the phase difference between the E and the current i in the circuit is observed to be 
, as shown in the diagram. If the circuit consists possibly only of R-C or R-L or L-C series, find the relationship between the two elements.
When an AC source of emf is connected across a circuit, the phase difference between the E and the current i in the circuit is observed to be , as shown in the diagram. If the circuit consists possibly only of R-C or R-L or L-C series, find the relationship between the two elements.
physics-General
physics-
An LCR circuit is equivalent to a damped pendulum. In an LCR circuit the capacitor is charged to 
and then connected to the L and R as shown below :
If a student plots graphs of the square of maximum charge 
on the capacitor with time (T) for two different values 
and 
of L then which of the following represents this graph correctly ? (Plots are shematic and not drawn to scale)
An LCR circuit is equivalent to a damped pendulum. In an LCR circuit the capacitor is charged to and then connected to the L and R as shown below :
If a student plots graphs of the square of maximum charge on the capacitor with time (T) for two different values and of L then which of the following represents this graph correctly ? (Plots are shematic and not drawn to scale)
physics-General
physics-
In the LCR circuit shown in figure unknown resistance and alternating voltage source are connected. When switch 'S' is closed then there is a phase difference of 
between current and applied voltage and voltage across resister is 
When switch is open current and applied voltage are in same phase. Neglecting resistance of connecting wire answer the following questions :
Peak voltage of applied voltage sources is :
In the LCR circuit shown in figure unknown resistance and alternating voltage source are connected. When switch 'S' is closed then there is a phase difference of between current and applied voltage and voltage across resister is When switch is open current and applied voltage are in same phase. Neglecting resistance of connecting wire answer the following questions :
Peak voltage of applied voltage sources is :
physics-General
physics-
A voltage source V = 
sin (100 t) is connected to a black box in which there can be either one element out of L, C, R or any two of them connected in series
At steady state. the variation of current in the circuit and the source voltage are plotted together with time, using an oscilloscope, as shown
If AC source is removed, the circuit is shorted for some time so that capacitor is fully discharged and then a battery of constant EMF is connected across the black box, at t = 0. The current in the circuit will –
A voltage source V = sin (100 t) is connected to a black box in which there can be either one element out of L, C, R or any two of them connected in series
At steady state. the variation of current in the circuit and the source voltage are plotted together with time, using an oscilloscope, as shown
If AC source is removed, the circuit is shorted for some time so that capacitor is fully discharged and then a battery of constant EMF is connected across the black box, at t = 0. The current in the circuit will –
physics-General
physics-
A voltage source V = sin (100 t) is connected to a black box in which there can be either one element out of L, C, R or any two of them connected in series
At steady state. the variation of current in the circuit and the source voltage are plotted together with time, using an oscilloscope, as shown
Values of the parameters of the elements, present in the black box are –
A voltage source V = sin (100 t) is connected to a black box in which there can be either one element out of L, C, R or any two of them connected in series
At steady state. the variation of current in the circuit and the source voltage are plotted together with time, using an oscilloscope, as shown
Values of the parameters of the elements, present in the black box are –
physics-General
physics-
A voltage source V = sin (100 t) is connected to a black box in which there can be either one element out of L, C, R or any two of them connected in series
At steady state. the variation of current in the circuit and the source voltage are plotted together with time, using an oscilloscope, as shown
The element(s) present in black box is/are :
A voltage source V = sin (100 t) is connected to a black box in which there can be either one element out of L, C, R or any two of them connected in series
At steady state. the variation of current in the circuit and the source voltage are plotted together with time, using an oscilloscope, as shown
The element(s) present in black box is/are :
physics-General
physics-
An ac generator G with an adjustable frequency of oscillation is used in the circuit, as shown.
Thermal energy produced by the resistance R in time duration 1 
s, using the source at resonant condition, is
An ac generator G with an adjustable frequency of oscillation is used in the circuit, as shown.
Thermal energy produced by the resistance R in time duration 1 s, using the source at resonant condition, is
physics-General
physics-
An ac generator G with an adjustable frequency of oscillation is used in the circuit, as shown.
Average energy stored by the inductor 
(Source is at resonance frequency) is equal to
An ac generator G with an adjustable frequency of oscillation is used in the circuit, as shown.
Average energy stored by the inductor (Source is at resonance frequency) is equal to
physics-General
physics-
An ac generator G with an adjustable frequency of oscillation is used in the circuit, as shown.
If the ac source G is of 100 V rating at resonant frequency of the circuit, then average power supplied by the source is –
An ac generator G with an adjustable frequency of oscillation is used in the circuit, as shown.
If the ac source G is of 100 V rating at resonant frequency of the circuit, then average power supplied by the source is –
physics-General
physics-
An ac generator G with an adjustable frequency of oscillation is used in the circuit, as shown.
To increase resonant frequency of the circuit, some of the changes in the circuit are carried out. Which change(s) would certainly result in the increase in resonant frequency ?
An ac generator G with an adjustable frequency of oscillation is used in the circuit, as shown.
To increase resonant frequency of the circuit, some of the changes in the circuit are carried out. Which change(s) would certainly result in the increase in resonant frequency ?
physics-General
physics-
An ac generator G with an adjustable frequency of oscillation is used in the circuit, as shown.
Current drawn from the ac source will be maximum if its angular frequency is –
An ac generator G with an adjustable frequency of oscillation is used in the circuit, as shown.
Current drawn from the ac source will be maximum if its angular frequency is –
physics-General
physics-
Statement-1 : In a series R,L,C circuit if 
, 
, and 
denote rms voltage across R, L and C repectively and 
is the rms voltage across the source, then 
.
Statement-2 : In AC circuits, kirch off voltage law is correct at every instant of time.
Statement-1 : In a series R,L,C circuit if , , and denote rms voltage across R, L and C repectively and is the rms voltage across the source, then .
Statement-2 : In AC circuits, kirch off voltage law is correct at every instant of time.
physics-General
physics-
In the AC circuit shown below, the supply voltage has constant rms value V but variable frequency f. At resonance, the circuit :
In the AC circuit shown below, the supply voltage has constant rms value V but variable frequency f. At resonance, the circuit :
physics-General
physics-
In the circuit shown in figure, if both the bulbs 
and 
are identical :
In the circuit shown in figure, if both the bulbs and are identical :
physics-General
physics-
A resistor R, an inductor L, a capacitor C and voltmeters 
, 
and 
are connected to an oscillator in the circuit as shown in the adjoining diagram. When the frequency of the oscillator is increased, up to resonance frequency, the voltmeter reading (at resonance frequency) is zero in the case of :
A resistor R, an inductor L, a capacitor C and voltmeters , and are connected to an oscillator in the circuit as shown in the adjoining diagram. When the frequency of the oscillator is increased, up to resonance frequency, the voltmeter reading (at resonance frequency) is zero in the case of :
physics-General
