facts about
ac alternating current
1. alternating current are current that
flow periodically reverse with time.
2. direct current are current that flow
in one direction.
3. alternating current are not gotten from battery or cell
4. alternating current are the current we got from gasoline engine,
diesel engine etc.
5. resistors do not only hinders current
flow but also increases voltages
potentials
6. reactance and impedance are vital
component of AC circuit.
7. resistance is the opposition to the
flow of electric current by a resistor.
8. reactance(X) is the opposition to
flow of electric current in ac circuit by either capacitor or inductor both.
9. impedance(Z) is opposition to flow of
ac current by RL circuit, RC circuit or RLC
circuits.
10.
R
stands for resistance, L stands for inductance and C for capacitance.
11.
a
typical AC circuit contain resistor,
capacitor and inductor.
12.
rms
value is how d.c current are measured in ac circuit.
13.
rms
value of an ac current it is the value of direct current that will produce the
same heating effects as the corresponding ac current.
14.
root
mean square values is the effective value of current.
15.
in
ac circuit the average value of both current and voltage is zero
16.
root
means square voltage is given by 0.707V0, where V0 is the
peak current.
17.
rms
current is given by 0.707I0 where I0 is the peak current.
18.
Resistance,
capacitance and impedance are measured in ohms.
19.
Capacitance
is given by X=XC–XL, where XC is the capacitive reactance and XL is the
inductive reactance.
20.
impedance
is given by Z=[R2 + (XL –XC)0.5 ]1/2 or Z=(R2
+ XL2)1/2 or Z=(R2
+ XC2)1/2
21.
Quality
factor of AC circuit is the measure of sharpness of current
22.
high quality factor means high selectivity.
23.
at
low frequency capacitive reactance is greater than inductive reactance.
24.
at
high frequency inductive reactance is greater than capacitive reactance.
25.
capacitive
reactance is equal to inductive reactance at resonant frequency.
26.
resonance
is a Large amplitude vibration of an oscillating when it is subjected to impulse at at its
natural frequency.
27.
Resonance
occurs when current and voltage in ac circuit are in phase.
28.
Resonance
occur when current is maximum.
29.
Resonance
occurs when circuit impedance matches the resistance of the circuit.
30.
Resonance
occurs in ac circuit when phase angle is equal to zero.
31.
In
ac circuit power is only dissipated in resistor and not capacitor or inductor.
32.
Power
factor is given by cosĪ.
33.
Opposition
due to the flow of ac current by capacitors only is called capacitive
reactance.
34.
Opposition
to the flow of ac current by inductors only is called inductive reactance.
35.
No comments:
Post a Comment