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Both the current and voltage are represented by sine waves. In a pure resistive circuit the current and voltage wave forms would have the positive and negatives peaks and zero crossings perfectly aligned with the other waveform. If they were 180 degrees out of phase the positive cycle peak of one would align with the negative peak of the other and would be producing zero power. In between a zero and 180 degree phase shift the Power Factor would range from 1 with zero phase shift to zero with 180 degree phase shift.
Power = Current x Voltage x Power Factor.
Another AnswerFor a three-phase supply, the term 'phase' describes any one of the armature windings; for a three-phase load, the term 'phase' describes any one of the three loads. The three energised conductors that join the load to the supply are called 'lines'.
So phase voltages are the voltages appearing across individual armature windings or loads, whereas line voltages are the voltages appearing across a any pair of line conductors.
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How do you shift an ac phase?
It really does depend upon what you mean by 'shift'. For purely-resistive circuits, the load current is in phase with the supply voltage. For reactive circuits, the load current will lead or lag the supply voltage; for capacitive-resistive circuits, the load current leads, whereas for inductive-resistive circuit, the load current lags. You can change the angle by which the current leads or lags (the 'phase angle') by changing the amount of resistance or reactance.
Why DC electricity does not have poly phase?
There is no such thing as phase in DC as phase requires AC. To have two or more things out of phase requires them to be changing. Only AC does that. DC is steady state.
Why does Jim use dc supply in oscillator circuits?
Jim use dc supply in oscillator circuits to and ac out put.
Can you tap off a 3 phase 277volt ac light fixture to power a single phase 120 volt ac recptacle?
NO! The voltages available in the 3-phase system are 480 (if you wire phase to phase) and 277 (if you wire phase to neutral) Don't try it!
In ac single phase circuits what is the neutral for?
The neutral in single phase AC circuits is used as the common power return conductor for half phase operation. In a typical (US/Canada) 120/240 split phase system, generally used in residential applications, the voltage between neutral and either of the two hot conductors is 120 VAC, and the voltage between the two hot conductors is 240 VAC. Neutral is also grounded at the distribution panel, as well as at the utility distribution transformer, in order to limit the voltage of any conductor relative to ground, and also to be able to detect ground faults by sensing imbalance between neutral and hot currents. Note that this is not called two phase power. It is single phase, or split phase, and it comes from one center tapped transformer winding. The center tap is neutral.
What does electricity refer to?
It is the complex ratio of the voltage to the AC (alternating current) circuit. It extends the concept of resistance to AC circuits due to magnitude and phase.
What does electrical impedance refer to?
It is the complex ratio of the voltage to the AC (alternating current) circuit. It extends the concept of resistance to AC circuits due to magnitude and phase.
Is three phase is ac or dc?
Three phase is ac
What is AC voltage terminology - in phase - mean?
If the current rises and falls with the voltage, then the two are said to be 'in phase'; this occurs in a purely-resistive circuit. For inductive or capacitive circuits, the current either lags or leads the voltage.
How do you shift an ac phase?
It really does depend upon what you mean by 'shift'. For purely-resistive circuits, the load current is in phase with the supply voltage. For reactive circuits, the load current will lead or lag the supply voltage; for capacitive-resistive circuits, the load current leads, whereas for inductive-resistive circuit, the load current lags. You can change the angle by which the current leads or lags (the 'phase angle') by changing the amount of resistance or reactance.
Kirchoff's Voltage and Current Laws apply to all ac circuits?
Kirchoff's Voltage and Current Laws apply to all AC circuits as well as DC circuits. Other laws, such as Ohm's law and Norton and Thevanin equivalents apply equally as well. The complicating factor is that, at AC, current and voltage are not usually in phase with each other, unless it is a simple resistive circuit. That makes the math harder, but it does not make it invalid or impossible.
What are the main difference while applying kirchoffs laws to dc circuits and ac circuits using meter readings?
For DC circuits, an alebraic sum is required. For AC circuits, a phasor sum is required.
What statements is not true for AC?
Ohm's law does not apply to AC circuits.
What is the use of capacitor in dc circuits?
It will minimize curent flutuations, it olso helps in AC circuits( in AC I tink it absorbs frequenci emmisions).
What does ac stand for in circuits?
alternating current
Classification of ac motor?
ac:1) 1 phase 2) poly phase 3)universal
Can resistors function the same in AC circuits as in DC circuits?
Yes, they both can add a load to a circuit.
