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Syllabus

A cylindrical wire is stretched to increase its length by 10%. Calculate the percentage increase in its resistance.

_{0}sin wt is applied across pure inductor. Obtain expression for current flowing in circuit. Hence write expression for instantaneous power supplied by voltage source to inductor. Show that average power supplied over a complete cycle is zero.what is wattless current?

A solenoid with an iron core and bulb are connected to a dc source. how does the brightness of the bulb change when the iron core is removed from the solenoid.??? its urgent

what is the dimensional formulas of mutual inductance.

A) its appliances are very costly

B) thin power cables are required

C) idle current very low

D) power loss is very less

Two bodies of masses m1 and m2 are connected by a light string which passes over a frictionless massless pulley . If the pulley is moving upward with uniform acceleration g/2 , then tension in the string is - 1) 3 m1 m2 g / m1 + m2 ..............2)m1 + m2 g / 4m1 m2 ..........3)2 m1 m2 g / m1 + m2 ..............4)m1 m2 g / m1 + m2 ..............

what is meant by sharpness of resonance?

depends.

define watt-less current?

A series LCR circuit is connected to an A.C source of voltage V and angular frequency w.(omega.) When only the capacitor is removed, the current lags behind the voltage by a phase angle 'phi' and when only the inductor is removed , the current leads teh voltage by tha same phase angle. Find the current flowing and the average power dissipated in teh LCR circuit.? Please REply fast Please.

by I = (2 + 3 sin ωt) A, then the effective value of

resulting current in the circuit is

(1)(17/2)

^{1/2}ampere(2) (2/17)

^{1/2}ampere(3)(3/(2)

^{1/2})^{1/2}ampere(4) 3(2)

^{1/2}ampere_{o}why is 220v ac more dangerous then 22ov dc?

project to investigate the relation between the ratio of

1)output & input voltage

2)no. of turns in secondary & primary coil of a self designed transformer

A sinusoidal voltage of peak value 283 V and frequency 50 Hz is applied to a series LCR circuit in which R = 3 W, L = 25.48 mH, and C = 796 μF.Find (a) the impedance of the circuit; (b) the phase difference between the voltage across the source and the current; (c) the power dissipated in the circuit; and (d) the power factor. In this question for finding P we use P=I^2 R and Irms=I/root2 but why do we divide 283 by 5?

Solve this :$8.\mathrm{If}\mathrm{current}{\mathrm{I}}_{3}=3\mathrm{A}\mathrm{sin}\mathrm{\omega t}\mathrm{and}{\mathrm{I}}_{2}=4\mathrm{A}\mathrm{cos}\mathrm{\omega t},\mathrm{then}{\mathrm{I}}_{3}\mathrm{is}:\phantom{\rule{0ex}{0ex}}\left(1\right)5\mathrm{A}\mathrm{sin}\left(\mathrm{\omega t}+53\xb0\right)\left(2\right)5\mathrm{A}\mathrm{sin}\left(\mathrm{\omega t}+37\xb0\right)\phantom{\rule{0ex}{0ex}}\left(3\right)5\mathrm{A}\mathrm{sin}\left(\mathrm{\omega t}+45\xb0\right)\left(4\right)5\mathrm{A}\mathrm{sin}\left(\mathrm{\omega t}+30\xb0\right)$

plz answer this question :- A resistor of 200 ohm and a capacitor of 15 micro F are connected in series to a 220V, 50 Hz a.c. source . Calculate the current in the circuit and the r.m.s. voltage across the resistor and capacitor.

what is power factor in an a.c. circuit?

A reactive element , in an AC circuit causes the current flowing.

1. To lead by pi by two

2. to lag in phase by pi by two w.r.t. the applied voltage

Identify the element in each case.

For circuits used for transporting electric power, a low power factor implies large power loss in transmission.Explain.

$168.Inthecircuitshowninfigure{X}_{L}=\frac{{X}_{C}}{2}=R,thepeakvaluecurrent{i}_{0}throughthea.c.sourceis$

$\left(1\right)\frac{\sqrt{5}{V}_{0}}{2R}\left(2\right)\frac{{V}_{0}}{2\sqrt{2}R}\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{{V}_{0}}{2R}\left(4\right)\frac{{V}_{0}}{2\sqrt{3}R}$

In series RC circuit , R=30ohm , C=0.25myuF , V=100V , and omega=100000rad/s1) find the current in the circuit?2)Calculate the voltage across R and C ?

3) Is the algebraic sum of these voltages more than the source voltage ? If yes , resolve the paradox?

full form of LCR circuit?

Q. Figure given below shows how the reactance of a capacitor varies with frequency

I) Use this information on graph to calculate the value of capacity of the capacitor.

II) An inductor of inductance L has the same reactance as the capacitor at 100 Hz. Find the value of L.

III) Using the same axes, draw a graph of reactance against frequency for the inductor given in part (ii).

IV) If this capacitor and inductor were connected in series to a resistor of 10 $\Omega $ what would be the impedance of the combination at 300 Hz?

Q. A resistance of 10 ohm, a capacitance of 0.1$\mu $F an inductance of 2mH are connected in series across source of alternating emf of variable frequency. At what, frequency does maximum current flow ?

1) 11.25 kHz 2) 23.76 kHz

3) 35.46 kHz 4) 46.72 kHz

what is the definition of quality factor

Power factor of an ac circuit is 0.5. What will be the phase difference between voltage and current in the circuit?

voltage, current and power in one cycle is shown in the following graph :

(a) Identify the device ‘X’.

(b) Which of the curves A, B and C represent the voltage, current and

the power consumed in the circuit ? Justify your answer.

(c) How does its impedance vary with frequency of the ac source ?

Show graphically.

(d) Obtain an expression for the current in the circuit and its phase

relation with ac voltage.

why does a capacitor block dc nd allows ac????

a bulb and a capacitor are connected in series to A.C.source of variable frequency.how will the brightness of the bulb change on increasing the frequency of the A.C. source? give reason for your answer.

ii. Calculate the value of additional capacitor which may be joined suitably to capacitor C that would make the power factor of the circuit unity.

wht is sharpness of resonance in series LCR- circuit ? a resistor of 200 ohm and capacitor of 15 muF

are connected in series 1:0 220V:50Hz ac sorce

a> calculate current in circuit

b>

calculate voltage across resistor and capacitor. is the algebric sum of these voltages more than sorce voltage if yes how?

A series

LCRcircuit withL= 0.12 H,C= 480 nF,R= 23 Ω is connected to a 230 V variable frequency supply.(a)What is the source frequency for which current amplitude is maximum. Obtain this maximum value.(b)What is the source frequency for which average power absorbed by the circuit is maximum. Obtain the value of this maximum power.(c)For which frequencies of the source is the power transferred to the circuit half the power at resonant frequency? What is the current amplitude at these frequencies?(d)What is theQ-factor of the given circuit?Show that in the free oscillations of an LC circuit, the sum of energies stored in the capacitor and the inductor is constant in time.

Q.41. The impedance of a R-C circuit is ${Z}_{1}$ for a frequency f and ${Z}_{2}$ for frequency 2f. Then, ${Z}_{1}$ / ${Z}_{2}$ is

(a) Between 1 and 2

(b) 2

(c) Between 1/2 and 1

(d) 1/2

(e) 4

what do you mean by Q-factor and whats is its importance ?

Define power factor. State the conditions under which it is (i) maximum and (ii) minimum.

through it and this current is in phase with the applied voltage. When another element Y is

connected across the same a.c. source, the same current flows in the circuit but it leads the

voltage by /2 radians.(i) Name the circuit elements X and Y. (ii) Find the current that flows

in the circuit when the series combination of X and Y is connected across the same a.c.

voltage.

The primary coil of an ideal step up transformer has 100 turn and transformation

_{L}= R and power factor of the circuit is P_{1}. When a capacitor with capacitance C such that X_{L}= X_{C}is put in series, the power factor becomes P2. Find P_{1}/ P_{2}.what is the principle of METAL DETECTORS ?

(i) Name the element X and Y.

(ii) Find the current that flows in the circuit when series combination of X and Y is connected across the same voltage.

(iii) Plot a graph showing variation of the net impedance of this series combination of X and Y as a function of the angular frequency of the applied voltage.

In an a.c circuit, instantaneous voltage and current are V=200sin300t volts and I=8cos300t Amp respectively. What is the average power dissipated in the circuit ? Why ?

An inductor 200 MH, capacitor 500µf, resistor 10Ω are connected in series with

Q. Alternating current is flowing in inductance L and resistance R. The frequency of source is $\omega $/2$\mathrm{\pi}$. Which of the following statement is correct :

(1) For low frequency the limiting value of impedance is L.

(2) For high frequency the limiting value of impedance is $\omega $L.

(3) For high frequency the limiting value of impedance is R.

(4) For low frequency the limiting value of impedance is $\omega $L.

Explain principle, working theory of Transformer.

^{-11}, Farad, L = 10^{-5}Henry and R = 100 ohm, when a constant D.C voltage E is applied to the circuit, the capacitor acquires a charge $10\xb0C$. The D.C source is replaced by a sinusoidal voltage source in which the peak voltage E. At resonance the peak value of the charge acquired by the capacitor will be.$\left(A\right){10}^{-15}C\phantom{\rule{0ex}{0ex}}\left(B\right){10}^{-6}C\phantom{\rule{0ex}{0ex}}\left(C\right){10}^{-10}C\phantom{\rule{0ex}{0ex}}\left(D\right){10}^{-8}C$

in a series LCR circuit the voltages across an inductor,capacitor, n a resistor are 30V,30V n 60V respectively.wat is the phase difference b/w the applied voltage n current in the circuit.??

Give principle construction working of AC generator.

When an alternating voltage of 220V is applied across a device X, a current of 0.5A

flows through the circuit and is in phase with the applied voltage. When the same

voltage is applied across another device Y the same current flows through the

circuit but it leads the applied voltage by /2 rad.

(a) Name the devices X and Y.

(b) Calculate the current flowing in the circuit when same voltage is applied across

the series combinations of X and Y.

_{0}sinwt.the variation of voltage,current and power in one complete cycle is shown in the following.which curve shows power consumption over a full cycle?identify the deviceX