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Syllabus

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

what is wattless current?

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}amperewhat is the dimensional formulas of mutual inductance.

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 ..............

how coswt = sin(wt+90) possible here??

what is meant by sharpness of resonance?

define watt-less current?

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

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?

V= 200sin ωt + 100sin 3ωt + 50sin5ωt

The electric field energy contained in a small volume, through which the wave passes, oscillates with frequency

(1) 1 Hz

(2) 2 Hz

(3) $\mathrm{\pi}$ Hz

(4) $\frac{1}{2}$ Hz

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

full form of LCR circuit?

^{-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.$\left(A\right){10}^{-15}C\phantom{\rule{0ex}{0ex}}\left(B\right){10}^{-6}C\phantom{\rule{0ex}{0ex}}\left(C\right){10}^{-10}C\phantom{\rule{0ex}{0ex}}\left(D\right){10}^{-8}C$

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?

An inductor 200 mH, capacitor 500 mF, resistor 10W are connected in series with a 100 V, variable frequency a.c. source. Calculate the(i) frequency at which the power factor of the circuit is unity.(ii) current amplitude at this frequency.(iii) Q-factor.

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.

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.

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

_{o}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.

An ac generator consists of a coil of 100 turns and cross sectional area of 3m² rotating at a constant angular speed of 60 rad/sec in a uniform magnetic field of 0.04T. The resistance of this coil is 500 ohm. Calculate i) Maximum current drawn from the generator and ii) Maximum power dissipated in the coil.

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 ?

(a) voltage across resistance is lagging by 90° than the voltage across capacitor.

(b) voltage across capacitor is lagging by 180° than voltage across inductor.

(c) voltage across inductor is leading by 90° than voltage across resistance.

(d) Resistance of the circuit is equal to magnitude of impedance of circuit.

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

Derive an expression for Avg.value of ac voltage?

Explain the fig of magnetisation and demagnetisation in NCERT page240?

Explain principle, working theory of Transformer.

_{m}sinwt over time interval t=0 and t = π / win 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.

Obtain resonance frequency of a series LCR circuit with L=2.0 H, C=32µF and R=10 Ω

_{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