What is the difference between phase voltage and phase current?
The terms 'phase voltages' and 'phase currents' are used in three-phase alternating-current systems, to distinguish them between 'line voltages' and 'line currents'.
In a three-phase system, the generator has three coils which generate voltages that are displaced from each other by 120 electrical degrees. The generator is then connected to the load using three conductors, called line conductors. The generator's three coils are described as 'phases', and the generated voltages are called 'phase voltages', while the currents flowing in them are called 'phase currents'. The voltages between the line conductors are called 'line voltages' and the currents flowing through the line conductors are called 'line currents'.
Similarly, the loads themselves represent 'phases', and the voltages appearing across the loads are called 'phase voltages' and the load currents are called 'phase currents'.
Depending on the configuration of the phases (they can be connected in 'delta' or in 'star'), the line voltages either equal the phase voltages or are 1.732 times larger than the phase voltages.
At resonance, the load current is in phase with the supply voltage.
when a resistive load is applied there is no phase angle difference between voltage and current. when a inductive load is applied there is phase difference between voltage and current. current lags voltage by an angle of 90 degrees for pure inductive load
Power factor measures the phase difference between voltage and current. If they are in phase the Power Factor is one. If the current and voltage are out of phase the power factor is between zero and one. You can describe the PF by saying the current lags the voltage with a PF = .8 or the voltage leads the current with a .8 PF.
The phase angle between voltage and current is the difference in time, usually expressed in degrees, between the voltage and current. This difference is due to the capacitive or inductive reactance of the circuit, causing the current to lead (capacitive) or lag (inductive) the voltage. In a theoretically perfect circuit, phase angle is +90 degrees for a capacitor and -90 degrees for an inductor. In a generator, phase angle is 180 degrees. In a (resistive)… Read More
1) in inductor there is generation of magnetic field due to flow of current . so there is phase difference in voltage and current . 2)in capacitor there is storage of charges. there is phase diff. 3)But in case of resistor there is no such things are happend . it is only a power dissipating element.therefor there is no phase difference between current and voltage.
The power factor is a measure of the phase difference. If they are exactly in phase the PF = 1. If they are 180 degrees out of phase PF = 0.
The phase angle between voltage and current in a purely resistive circuit is zero. Voltage and current are in phase with each other.
because of the reactances in the circuit
Although we use the term 'Phase angle' it's also an angle referred to another phasor (voltage or current). For example, conventionally when expressing power factor, we use 'voltage' as the reference. So the 'phase angle' of a particular phasor is the phase difference between our reference (voltage) & the phasor. As the gist, both mean the same except that 'phase angle' is the direction of the phasor w.r.t. positive x direction (reference).. Answer By definition… Read More
What is the current difference in a 3 phase motor running continuously in star connection and delta connections?
The voltage difference between star and delta is 1.732, the square root of 3, or, going from delta to star, 1 over 1.732, which is 0.5774. That is the same as the current difference, neglecting motor efficiency at the two different operating voltages. The power difference between star and delta is 1.7322, or 3, and between delta and star is 0.57742, or 0.3333. <<>> In a wye connection, the line current is equal to the… Read More
Compare the phase relationship between the voltage and current in a purely resistive circuit and an RL circuit?
In a pure resistive circuit the voltage and current are in phase. In an inductive circuit they are fro zero to 180 degrees out of phase. If they are in phase the Power Factor is 1 and 180 degrees the PF is zero. The exact amount of the phase difference depends on the specific circuit.
Voltage and current will be in phase for a purely resistive load. As a load becomes more inductive or capacitive, the phase angle between voltage and current will increase.
Two locations are said to be "in phase" when the waveform is "lined up" so there is no voltage difference between the two points. They are out of phase if there is a voltage difference between them. If you are looking at an oscillograph reading of both, if they are in phase the waveforms will be identical magnitude at the same time. If out of phase, one will be shifted relative to the other causing… Read More
The phase angle between voltage and current in a purely inductive circuit, under ideal circumstances where there is no resistance at all, is 90 degrees.
They are IN-Phase.
Current is a vector quantity with certain magnitude and direction same as Voltage or Potential Difference . So when flows in any circuit, it is in phase or out of phase with applied voltage, if its magnitude and direction is changing before applied voltage then said to be leading current and if after then lagging current.
Power Factor is the relationship between the phase of the current and voltage which are each sine waves. When there is an inductance in a circuit the AC current waveform tends to lag the voltage. This causes a phase difference which reduces the Power Factor from a maximum of one to something less.
A three phase supply has a 120 degree AC voltage difference between phases. For example: a 240VAC three phase circuit has three phase (hot) leads that measure 120VAC to neutral or ground. The voltage difference between two hot leads is 208VAC (120 * tangent of 120 degrees).
Power factor is well defined and measures the difference between the phase of current and voltage. It varies from 1 to zero with 1 being associated with a pure resistive load. Since you multiply voltage times current to compute instantaneous power; if they are out of phase then you get reduced power. A power booster, in this context, would be a device that was designed to compensate for the our of phase situation and bring… Read More
Resistance is a concept used for DC. the current through a resistance is in phase with the applied voltage Reactance is used for AC the current through a inductive reactance lags the applied voltage by 90 degrees. the current through capacitive reactance leads the applied voltage by 90 degrees. the net reactance is the difference between inductive and capacitive reactance
Power factor is related to the phase angle between voltage and current. It is a measure of the difference between true and apparent power. In a purely resistive circuit, voltage and current will be in phase, and the power factor will be 1. In a circuit with capacitive or inductive reactance, current will lag voltage (inductive) or lead voltage (capacitive). In the worst case, power factor is zero with 90 degrees of lag or lead… Read More
The current is the same in the three live wires. The voltage can be described as the line voltage (phase to neutral) or the phase voltage (phase to phase) which is larger by a factor of sqrt(3). So a line voltage of 230 v corresponds to a phase voltage of 400 v.
Balanced Star (Wye) Connected Systems: Line Voltage = 1.732 x Phase Voltage Line Current = Phase Current Balanced Delta Connected Systems: Line Voltage = Phase Voltage Line Current = 1.732 x Phase Current
When a sinusoidal alternating voltage is applied in a circuit, the resulting alternating current is also sinusoidal and has the same frequency as that of applied voltage .However, there is generally a phase difference between the applied voltage and the resulting current.This is how alternating-current circuit works. If you want more ,send message
In a three-phase system, a line voltage is the voltage measured between any pair of line conductors. The line current is the current flowing in any of the lines. Line voltages are usually numerically equal when measured between any pair of lines. Each line current, however, may be different if the load is unbalanced, or the same if the load is balanced. In a residence, the line voltage is the voltage between the incoming line… Read More
A DC motor runs on DC (Direct Current) which means there is a constant voltage source. A single phase induction motor is a type of motor which requires an AC (Alternating Current) source, which means the voltage source alternates between a positive and negative value. It is almost always a sinusoidal shaped wave.
Power factor is the cosine of the phase angle between voltage and current. In a resistive load, current is in phase, i.e. with a phase angle of 0 degrees, with respect to voltage. Cosine (0) is 1.
Phases in AC refer to the number of sine waves of alternating current used to generate the average voltage. In 2 phase, two opposing sine waves are overlapped to give the average voltage delivered, eg 240V in household supplies. In 3 phase, three sine waves are overlapped to produce a more consistent average voltage.
The main difference between star and delta is that in star, the phase voltage is root 3 multiplied by the line voltage making the speed of the machine to run at low speed while in delta, the phase voltage is equal to the line voltage making the machine to run at high speed.
In a pure (ideal) capacitive circuit, current leads voltage by 90 degrees.
Power Factor measures the difference in phase between the current and voltage. When they are in phase the Power Factor is defined as 1. When out of phase the value is less than 1. If they are 180 degrees out of phase the Power Factor will be zero.
In inductive circuits the current phase lags behind the voltage phase. The phase difference between current and voltage can mean you can get heavy currents flowing that aren't doing useful work, yet contribute to wasted power if they flow in other parts of the circuit (or even in surrounding metal screens etc) . In some circuits, such as tuned circuits, inductance is an important feature so resistive components have to be avoided there.
600 volts between any two wires. The phase has nothing to do with voltages, only current relationship.
The phase angle is defined as the angle by which the load current leads or lags the supply voltage. For a purely-resistive load, the phase angle is zero, because the load current is in phase with the supply voltage. For a purely-inductive load, the phase angle is 90 degrees lagging. But few loads are either purely-resistive or purely-inductive; typically, most loads are resistive-inductive. This means that, typically, the phase angle lies somewhere between zero and… Read More
AC circuit that contains both resistance and inductance will have a.The current and voltage in phase b.current will lead the voltage c.current will lag the voltage d.voltage will lag the current?
a. the current and voltage in phase
Voltage leads current in an inductive circuit. The amount of shift depends in the amount of inductance.
Power is defined as a function of the current and voltage, AND, in AC (Alternating Current) circuits any phase shift between the applied voltage and the resulting current. For pure RESISTIVE circuits (incandescent lamps, electric stoves, electric space heaters, etc.) operating on DC (direct current), the current in amperes is equal to the DC voltage divided by the resistance (in ohms) of the "load". In circuits containing inductive "loads" (transformers, motors, etc.) and operating on… Read More
star connection like y whle delta connection like a triangle. in star connection there is adifference between line voltage and phase voltagewhi delta connection line voltage and phase voltage are same. in star connectin line voltage is always greater than phase voltage
current leads the voltage
Inductance has no effect on the total current ... effective, RMS, amplitude, etc. ... in an AC circuit. It only affects the phase difference (angle) between the voltage wiggles and the current wiggles.
If two phase voltages are the same voltage and the same phase angle, the the resultant voltage will be twice the voltage.
You must knew there's a sinusoidal wave form for both voltage nd current. That wave form is drawn between voltage/current nd phase angle. Unity: phase angle of voltage nd current matches, irrespective of magnitude leading: phase angle of current leads voltage by an angle lagging: phase angle of voltage leads current or current lags voltage by an angle Answer The terms, 'leading' and 'lagging' apply to a.c. loads. 'Leading' means that the load current leads… Read More
The phase difference between any two live lines is 120 degrees, which allows them to peak in turn in the 360-degree cycle.
The power factor depends on the phase angle between the voltage and current on a conductor. The amplitude of the current has no effect on it.
P=vi Power = Current x Voltage x Power Factor Power Factor ranges from zero to 1 which is a pure resistive load. Basically it is a measurement of the lag in phase between current and voltage.
Assume you are saying that the current and voltage are in phase and you want to know how power is affected. When Voltage and Current are in phase the Power Factor is 1 and you have maximum power being applied. When Voltage and Current are not in phase, Power Factor decreases from 1 toward zero.
A circuit has a voltage of 240 volts and an inductive reactance of 30 ohms what is the current flow?
A circuit with a voltage of 240 volts and an inductive reactance of 30 ohms would have a current of 8 amperes. Reactance works just like resistance. The difference is that the phase angle between voltage and current is not zero, so the ratio of true power versus apparent power is not one. Phase angle and power factor depend on frequency. This was not specified in the question, so it is not answered.
The difference between watts and volt-amperes is due to the relative phase angle, or power factor, between voltage and current. In a DC system, the two are in phase. In an AC system, with only resistance, the two are also in phase. Add capacitance or inductance and the phase angle changes.
The phase voltages (i.e. line-to-neutral in a 4-wire system, or line-to-line in a 3-wire system) of a three-phase system are displaced from each other by 120 electrical degrees. Each phase voltage, in fact, is rarely in phase with its phase current, as the phase-angle (the angle by which a phase current lags or leads its phase voltage) is determined by the load not by the supply. In general, most loads are resistive-inductive so the phase… Read More
When you turn on a switch between a battery and capacitor, there is an inrush of current, but we measure zero volts across the cap because it is effectively shorted at this instant. As the cap charges, current drops and voltage rises. When it's fully charged, the voltage is max, and no more current flows. If we put AC across the cap, it does this every half cycle. Max, current, zero volts, building up to… Read More