Advertisements
Advertisements
प्रश्न
Define capacitive reactance. Give its units.
उत्तर
The peak value of current I is given by Im = `"v"_"m"/(1//"c"_omega)`. Let us compare this equation with Im = `"V"_"m"/"R"` from resistive circuit. The quantity `1/(omega"C")` plays the same role as the resistance R in resistive circuit. This is the resistance offered by the capacitor, called capacitive reactance (XC). It measured in ohm.
XC = `1/(omega"C")`.
APPEARS IN
संबंधित प्रश्न
An inductor 20 mH, a capacitor 50 μF and a resistor 40Ω are connected in series across a source of emf V = 10 sin 340 t. The power loss in AC circuit is
Define inductive reactance and give its units.
The capacitive reactance in an A.C. circuit is ______.
The rms value of potential difference V shown in the figure is ______.
In an alternating current circuit consisting of elements in series, the current increases on increasing the frequency of supply. Which of the following elements are likely to constitute the circuit?
Which of the following graphs represent the variation of current(I) with frequency (f) in an AC circuit containing a pure capacitor?
Which of the following is independent of the frequency of a.c?
An inductor of inductance L, a capacitor of capacitance C and a resistor of resistance ‘R’ are connected in series to an ac source of potential difference ‘V’ volts as shown in figure. Potential difference across L, C and R is 40 V, 10 V and 40 V, respectively. The amplitude of current flowing through LCR series circuit is `10sqrt2` A. The impedance of the circuit is :
For a series LCR circuit, I vs ω curve is shown:
- To the left of ωr, the circuit is mainly capacitive.
- To the left of ωr, the circuit is mainly inductive.
- At ωr, impedance of the circuit is equal to the resistance of the circuit.
- At ωr, impedance of the circuit is 0.
An inductor of 0.5 mH, a capacitor of 200 µF, and a resistor of 2Ω are connected in series with a 220V ac source. If the current is in phase with the emf, the frequency of ac source will be ______ × 102 Hz.
