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Phase is a term that applies to alternating current or AC.
The voltage of the supply goes through a cycle where it increases from zero to a peak value, then runs back to zero and out to a negative peak value, and then back to zero. It does that 50 or 60 times (cycles) each second.
When a load is connected, current flows and the current also goes through the cycle of variations, exactly the same number each second. If the current keeps exactly in step with the voltage that is good and the voltage and current are 'in phase', but if the current is out of step it is 'out of phase'.
The problem with out-of-phase currents is that there is a short period in each cycle when power flows the wrong way, back into the supply, so the overall power for a given amount of current is less than it should be. Instead of the power being voltage times current, it is voltage times current times a power factor that is less than 1.
The power factor is the cosine of the phase difference between the voltage and the current. If the current is 90 degrees (one quarter of a cycle) out of phase, as it would be if the load was a capacitor, the power factor is cos 90 degrees, or zero, so no power flows even though current flows. But that current still produces power loss in the supply wiring, so the electric companies dislike loads with a poor power factor because they have no revenue for that lost power.
What else can I help you with?
Why do you have voltage to ground but not voltage phase to phase?
There is phase to phase voltage in 3 phase system.AnswerYou don't get voltage 'phase-to-phase'; it's 'line-to-line'!
What are the three types of phase on its final phase?
single phase, double phase & three phase
In a 240 volt single phase circuit A phase is 4000 watts B phase is 7000 watts what is the neutral load?
Question is incorrect. in a 240 Volt single phase circuit, how can you have A phase and B phase?
What is the difference between a one phase and a three phase motor. And if a three phase motor is given a single phase supply will it run or not?
The difference between a single phase and a three phase motor is the amount of power conductors that feed the device. As to the other part of the question a three phase motor will not start or run on single phase. The phase angles on three phase are 120 degrees apart on a single phase system they are 180 degrees apart.
How a 3 phase generator work?
For information about three phase electrical services see the answers to the Related Questions shown below.
What degree is xenon at normal phase?
The answer depends on what is meant by "normal phase".
What is meant by the moons phase?
shoearah
What is meant by zero phase frequency?
The zero phase frequency is the frequency at which the phase of the input signal and the output signal match.
What is meant by electrical phase?
according to my research a phase in electrical engineering means a single line or a single way of transmission
What is meant by phase of the moon?
Different ways of seeing the moon from the earth
What is meant by medium?
the component in which the dispersed phase is suspended is called dispersing medium
What is meant by disperse medium?
the component in which the dispersed phase is suspended is called dispersing medium
What is meant by milestones of development?
milestone is the end of a stage that marks the completion of a work package or phase
Temperature that carbon freezes?
Carbon has a freezing point of about 3527oC under standard conditions. If you meant carbon dioxide, it freezes from a gas phase ar -78oC Carbon has a freezing point of about 3527oC under standard conditions. If you meant carbon dioxide, it freezes from a gas phase at -78oC
Is phase book allowed in Islam?
It is not understood what is meant by Phase book. However, no book is forbidden in Islam except sex books that encouraging illegal sex or causing sexual excitements and books that reading them is adding no value to ones culture or beliefs.... You probably meant Facebook, not all are forbidden.
What is the phase of the moon at the highest point at sunrise?
Could be anything, the two phenomena are not connected. If you meant, what is the phase of the moon when it is at its highest point at sunrise, the answer is it is approximately at 3rd quarter, a half moon facing east.
Where can I find more information about the bariatric diet?
I found this website to be particularly well laid out. It describes what your diet should be after gastric bypass surgery (I am assuming this is what you meant by a bariatric diet) there are 4 phases: 1. liquid foods phase 2. pureed foods phase 3. soft solid foods phase 4. solid foods phase.
