Advertisements
Advertisements
Question
What is wattles current?
Advertisements
Solution
Wattless current is defined as the current that does not consume energy and thus consumes no power.
The average power consumed over a complete cycle in a purely inductive or purely capacitive circuit is zero, and thus the corresponding alternating current in the circuit is referred to as wattless current.
APPEARS IN
RELATED QUESTIONS
Obtain an expression for average power dissipated in a purely resistive A.C. circult.
A resistor of 500 Ω and an inductance of 0.5 H are in series with an AC source which is given by V = `100 sqrt2` sin (1000 t). The power factor of the combination is ______.
In a series LCR circuit, the phase difference between the voltage and the current is 45°. Then the power factor will be ______.
When an AC source is connected to an ideal inductor show that the average power supplied by the source over a complete cycle is zero.
An AC source generating a voltage e = e0sinωt is connected to a capacitor of capacitance C. Find the expression for the current i flowing through it. Plot a graph of e and i versus ωt.
A light bulb is rated 100W for 220 V AC supply of 50 Hz. Calculate
- resistance of the bulb.
- the rms current through the bulb
A 25 μF capacitor, a 0.10 H inductor, and a 25Ω resistor are connected in series with an AC source whose emf is given by e = 310 sin 314 t (volt). What is the frequency, reactance, impedance, current, and phase angle of the circuit?
Give any one definition of power factor.
L-C-R series circuit contains a resistance of 10 Ω and self-inductance 0.4 H connected in series with variable capacitor across 60 V and 50 Hz supply. The value of capacity at resonance will be π2 = 10.
In series LCR circuit, resistance is 18 `Omega` and impedance is 33 `Omega`. An r.m.s. voltage of 220 V is applied across the circuit. The true power consumed in a.c. circuit is ____________.
The voltage gain of a CE amplifier is 50. A sinusoidal ac of amplitude 10 mV is applied as a signal. The output of the amplifier will be ______.
In a series LR circuit XL = R and power factor of the circuit is P1. When capacitor with capacitance C such that XL= XC is put in series, the power factor becomes P2. The ratio `"P"_1/"P"_2` is ______.
Two unknown resistances are connected in two gaps of a meter-bridge. The null point is obtained at 40 cm from left end. A 30 Ω resistance is connected in series with the smaller of the two resistances, the null point shifts by 20 cm to the right end. The value of smaller resistance Ω is ______.
In series LCR circuit R = 18 Ω and impedance is 33 Ω An rms voltage 220V is applied across the circuit. The ture power consumed in AC circuit is ______.
A conductor lies along the Z-axis at −1.5 ≤ Z ≤ 1.5 m and carries a fixed current of 10.0 A in −az direction as (see figure). For a field B = 3.0 × 10−4`"e"^(−0.2"x")`ay T, find the power required to move the conductor at constant speed to x = 2.0 m, y = 0 in 5 × 10−3 s. Assume parallel motion along the x-axis.
What is the average value of alternating current over a complete cycle?
The power factor of LCR circuit is ______.
Explain the theory of an AC circuit with a resistor.
Where is the power dissipated in an alternating current circuit?
In an a.c. circuit, voltage and current are given by:
V = 100 sin (100 t) V and I = `100 sin (100 t + pi/3)` mA respectively.
The average power dissipated in one cycle is:
What is the power in a DC circuit?
What is the phase angle in a pure resistive circuit?
What is another name for wattless current?
What is the average power when \[\cos\phi=0\]?
In the instantaneous-power expression, what does \[V_m\] represent?
In the instantaneous-power expression, what does \[I_m\] represent?
What does \[\omega\] represent in the instantaneous-power expression?
What does \[t\] represent in the instantaneous-power expression?
What does \[\phi\] represent in the voltage and current expressions for a series LCR circuit?
In a circuit where current lags voltage, which ratio gives the power factor?
Which component of current is along the applied voltage \[V\]?
Which component of current is perpendicular to the applied voltage \[V\]?
Why is \[I_p\] known as the power component?
After the lagging and leading wattless currents cancel, what is the effective power?
For a series LCR circuit with \[C=796\,\mu\mathrm{F}\] and frequency \[50\,\mathrm{Hz}\], what is the capacitive reactance?
What is the impedance of a series LCR circuit with \[R=3\,\Omega\], \[X_L=8\,\Omega\], and \[X_C=4\,\Omega\]?
What phase difference is obtained from \[\phi=\tan^{-1}((X_C-X_L)/R)\] when \[X_C=4\,\Omega\], \[X_L=8\,\Omega\], and \[R=3\,\Omega\]?
What is the resonance frequency corresponding to \[\omega_0=222.1\,\mathrm{rad/s}\]?
What is the impedance of a series LCR circuit at resonance when \[R=3\,\Omega\]?
On what principle does a metal detector doorway work?
What circuit arrangement does a person walk through in a metal detector doorway?
