When the current and voltage waves are in phase. what is the phase angle?
The phase angle is zero, when in phase.
The voltage and current sine waves cross the zero line at the same time and going in the same direction. The phase angle is 0°. They are said to be in-phase.
Lead the voltage waves
The frequency of the power waveform in a capacitive circuit, or for that matter, an inductive circuit, is the same as the input voltage or current. Its just that the current leads the voltage (capacitor) or lags the voltage (inductor) by a phase angle, the cosine of which is the power factor. It does not matter how many sine waves you have, or what their phase angle is; if they all have the same frequency… Read More
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.
Power Factor measures how much the current and voltage waveforms are out of phase. You get most efficient power transfer when the sine waves for voltage and current exactly match. When you multiply peak voltage and current you get the largest power. Depending on the phase relationships, you can bring the voltage and current waveforms into phase when you retard one or advance one against the other. Power Factor ranges from zero when the waveforms… Read More
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.
The Principle of interference is that waves add or subtract dependent on the phase or angle difference between the two waves. In phase waves (0 degrees) add and out of phase waves (180 degrees) subtract.
Watts = Current x Voltage x Power Factor In an AC circuit both the voltage and current are sine waves. When they are in phase (waveforms lie over top of one another) the PF is one. As they become out of phase the PF decreases to zero. This happens when the phase difference is 180 degrees. In this case the positive peak of current is at the same place in time as the negative peak… Read More
If you have V = 120Vrms Cos(2*pi*60t + 120). The magnatude of the voltage is 120Vrms. The frequency is 60Hz. The phase shift is 120. That would be the voltage that comes out of a standard American household eletrical outlet. The current would depend on what is plugged into the outlet. A general equation would be VmCos(w*t + theta) or ImCos(w*t + theta) for current. To use a Sine wave, just do a 90 degree… Read More
When power factor is at unity, the voltage and current waves are aligned or in phase with one another. Since power is the product of voltage and current, power transfer is maximized at unity power factor. When power is transmitted at a lower power factor, greater current is required to deliver the same amount of power. When current is increased, the size of the transmission, distribution and generation systems, all have to be increased accordingly… Read More
A neutral wire is used to carry the returning current from electrical equipment back to the source of supply. In a 3 phase system the sine waves on each phase are shifted 120 degrees. So for a balanced 3 phase load, such as a motor, the current to the motor is carried by two phases and the returning current by the other phase.
No! The concept of three phase alternating electricity refers to the relational phase differential of three alternating current single phase sine waves, each displaced 120 degrees of phase angle from the other. <><><><><><><> Addetion: still the is a three wire DC transmission system. usually DC transmission used for several resone but the most know one is when the transmission line is longer than 600 km
Waves in phase add to each other and become stronger.
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… Read More
Electromagnetic waves are generated whenever electric voltage is applied to a conductive material. In an antenna there is both voltage and current. Since the energy has nowhere to go it creates a field around the conductor. When the voltage is reversed some of the energy escapes as electromagnetic waves. Another useful source is the magnatron in a microwave oven. Same principle but the wavelength is shorter.
The Voltage produced by the generator will be like 3 sets of your home's voltage (assuming we're looking at an outlet and not the 220V at the brkr box). Each phase (sinusoidal wave) will be separated by 120 degrees, so when the 1st phase starts the 2nd phase will start 1/20th of a second later. The 3rd phase then starts 1/40th of a second later, and the 1st phase starts again 1/60th of a second… Read More
solution: Erms=100 V Irms=2 A p.f.=0.8 As per formula, Power(W)= Erms * Irms * p.f. = 100 * 2 * 0.8 = 160 W The ratio of watts average power (the average power measured in watts) to the apparent power of an alternating-current circuit. By definition, the equation below holds, which is the ratio of instrument readings. A watt-meter indicates average power, and http://www.answers.com/topic/electrodynamic-instrument or iron-vane instruments show rms voltage and current. For the steady-state… Read More
No, not at all. Single phase power consists of two "hot" conductors whose sine waves are 180 degrees apart. Three phase power has three "hot" conductors whose sine waves are 120 degrees apart. The voltage level has nothing to do with it.
The power required by the appliance is directly proportional to the current,voltage, power factor. If the power factor is low, more current is required to supply the rated power of the appliance hence the ohmic losses increase. Therefore the efficiency decreases and the voltage regulation increases which is bad for the power company as well as the consumer. <><><> In the study of alternating current [that which supplies our homes and businesses in the United… Read More
Consider sine waves for e.g sin 120+240j (sin A+Dj) where A - magnitude D - angle or radians j - sqrt (-1) then draw the 2 dimensional graph by using the above conditions Answer For a series circuit, the current is the reference phasor which should lie along the positive horizontal axis. Next, draw the voltage drop across the resistive component (UR) parallel with the reference phasor. Next draw the voltage drop(s) across the inductive… Read More
If two waves start out in phase with one another but one wave travels half a wavelength farther than the other before they come together will the waves be in phase or out of phase when they combine?
Out of phase
No. Waves that are out of phase (negative interference) will essentially cancel each other out. Waves that are in phase with each other (positive interference) will combine to create a larger wave.
La Phase means the phase. Phase in sinusoidal functions or in waves has two different.
Light waves with the same phase and frequency are said to be coherent.
According to Faraday's law: "When current is passed through a conductor, an EM field is produced surrounding it." As an antenna contains one or more conductors, the terminals of which are connected to some voltage, when this voltage at the terminals is applied, it produces/induces the alternating current which radiates the elements in the electromagnetic field. (Transmission) The reverse of this occurs in reception; where the electromagnetic field from another source induces an alternating current… Read More
It is quiet.
Compare the loudness of sound waves that are in phase when they interfere with the loudness of sound waves that are out of phase when they interfere?
they bounce im blood crips die
What determines whether constructive or destructive interference occurs when waves meet and coincide?
The phase of the waves. When two waves meet, and their crests and troughs align, they are "in phase" and constructive interference occurs. When their crests and troughs are opposites, they are "out of phase" and destructive interference occurs.
The angle of incidence of a light ray = the angle of reflection. Also, when light is incident on a medium of higher density than the current medium (e.g. a glass mirror in air) then the wave undergoes a 180 degree phase shift. If the surface is rough and bumpy, then the rays are scattered about all over the place. I hope this answers your question, i dont know how detailed an answer you wanted.
One source is the power lines that carry AC voltage and current. Please refer to the RELATED LINK for a picture of the electro-magnetic fields.
No. In order to be coherent, the light waves have to be in phase and stay in phase, and the only way for that to happen is for them to have the same wavelength and frequency.
Reinforcement of waves that are in phase with eachother.
You calculate power by multiplying voltage x current x Power Factor (PF). PF = 1 for a resistive load so you essentially convert maximum power with a resistive load. With an inductive load the PF decreases from 1 toward zero. Hence the lower the power factor the less efficient the system. This reduced PF is caused by the current and voltage sine waves being out of phase. If they are 180 degrees out of phase… Read More
The friction of hitting the beach at an angle causes the waves to bend.
Superimposing of waves is when two or more waves travel through the same medium and intersect. The net displacement is the addition of the waves amplitude. If they are in phase they increase amplitude; out of phase, the amplitude decreases.
For two waves to be coherent both must be having the same frequency and be in phase or having constant phase difference. This is applicable for light as well as sound waves. Hence coheren sound waves.
* Refraction occurs when a wave crosses a boundary from one medium to another. A wave entering a medium at an angle will change direction. * Diffraction refers to the "bending of waves around an edge" of an object. Diffraction depends on the size of the object relative to the wavelength of the wave. * Reflection:Waves can and do meet boundaries in their medium. When a wave meets a boundary, it can be reflected or… Read More
they are in phase
Phasing is distinguishing the conductor voltage characterstics and magnitude with respect to other conductors. Phase neutral.. Phase at a definite potential and neutral at zero. In three phase All three phases are at same voltage but are 120° apart from other in their cycles. Its an engineering thing to understand. <<>> Phasing describes the exact moment that a sine-wave starts from zero. In 3-phase systems there are three live wires, and each one is 'phased'… Read More
Th angle of vibration is 90 degrees different..
How sand and other materials are carried parallel to the shore by the waves. The waves approach the beach at an angle. Longshore drift is the movement of sediment along the coastline. Longshore drift is the transport of erosion sands along a shoreline by the current flowing along it.
They are refracted, and the new angle of travel appears as an increase to the initial angle of incidence.
it moves in a right angle
a)set of sine waves b)set of sine waves with phase zero
When two waves arrive at a point "in phase" their peaks and troughs align, this causes constructive interference. The amplitude of the two waves will add up at this point, therefore creating a brighter light or a louder sound, for example. For interference to occur the two waves must be coherent, meaning that they are of identical wavelength. If the sources are not coherent, the waves will be constantly moving in and out of phase… Read More
Unlike AC, which HAS waves, DC current is waveless- either on or off. No waves= no wave length.
RMS (root mean square, 1.414) voltage of an AC (alternating current) sine wave represents its actual ability to do work. What can be converted to direct current, DC. Since the sine waves voltage (and current) varies constantly as it goes from zero to a peak through out its cycle it goes from no potential to a large potential to do work. The rms represents the power time of wave. The multiplier of 0.607 times peak… Read More
it causes current waves.