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A cylindrical wire is stretched to increase its length by 10%. Calculate the percentage increase in its resistance.
what is wattless current?
what 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 ..............
what is meant by sharpness of resonance?
define watt-less current?
how coswt = sin(wt+90) possible here??
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
Aim is to investigate the relation between: i) output and input voltage ii) number of turns in the secondary coil and primary coil of a self designed transformer.
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?
For circuits used for transporting electric power, a low power factor implies large power loss in transmission.Explain.
full form of LCR circuit?
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?
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.
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
calculate voltage across resistor and capacitor. is the algebric sum of these voltages more than sorce voltage if yes how?
series LCR circuit
with L =
0.12 H, C =
480 nF, R =
23 Ω is connected to a 230 V variable frequency supply.
is the source frequency for which current amplitude is maximum.
Obtain this maximum value.
is the source frequency for which average power absorbed by the
circuit is maximum. Obtain the value of this maximum power.
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?
What is the Q-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.
why do birds fly off a high tension wire when the current is switched on?
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
Explain the fig of magnetisation and demagnetisation in NCERT page240?
what do you mean by Q-factor and whats is its importance ?
2.)Alternately magnetizing and demagnetizing, the iron core cause loss of energy. WHY ?
The primary coil of an ideal step up transformer has 100 turn and transformation
what are LC OSCILLATIONS?what sort of questions will be asked regarding this topic ????
D.C circuits n measurement
A high resistance voltmeter connected accross the terminals of a battery reads 15V .When an ammeter is included in the circuit the voltmeter reads 9V and an ammeter reads 1.5A .Find(1)the internal resistance of the battery (2)resistance of ammeter plus the connecting wires..........
(ans (1) 4 ohms (2)6 ohms
M.E plzz answer
what is the principle of METAL DETECTORS ?
VL = 20V VC =20V and VR=40V. what is the phase difference bwtween V and I in an LCR circuit?
A capacitor, a resistor of 5 ohm and an inductor of 50 mH are in series with an A.C. Sourcenmarked 100V, 50 Hz. It is found that voltage is in phase with the current. Calculate the capacitance and the impedance of the circuit.
what is rms value and how to derieve it??
An inductor 200 MH, capacitor 500µf, resistor 10Ω are connected in series with
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.
Explain principle, working theory of Transformer.
a dynamo dissipates 20 watt when it supplies a current of 4 A through it. if the terminal potential difference is 220V then the emf produced is ?
how? plz explain.
What is the difference between RLC and LCR ?
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.
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