# When the current and voltage waves are in phase. what is the phase angle?

The phase angle is zero, when in phase.

### What is the phase angle of the voltage with respect to the current in a resistive circuit?

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.

### A capacitive device in a single phase ac circuit causes the current waves to?

Lead the voltage waves

### What is the frequency of the power waveform in capacitive circuit?

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

### What is the difference between 3 phase and 2 phase?

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.

### Why do you use a phase advancer to improve the power factor?

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

### How does reactive power change the Power Factor?

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.

### What is the principle of interference?

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.

### What do you mean by wattless current and power factor in AC?

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

### What are the voltage and current values of sine waves?

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

### Why do we need unity power factor?

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

### Why is a neutral not used in a three phase motor?

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.

### Is there such a thing as 3 phase dc voltages?

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

### For AC circuits what is meant by the term in phase?

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

### Sources of electromagnetic waves?

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.

### What is the relationship between phase and line voltage in a 3-phase generator?

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

### What is the real power if Erms100v Irms2A and the circuit has a power factor of 0.8?

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

### Is 208v 3ph the same as 220 1ph?

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.

### Is low power factor good or bad to the power company or consumer?

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

### How to draw phasor diagrams?

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

### Do waves that are out of phase ad together to make a bigger wave?

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.

### What does la phase mean?

La Phase means the phase. Phase in sinusoidal functions or in waves has two different.

### What is a term that describes crests and troughs of light waves moving in phase?

Light waves with the same phase and frequency are said to be coherent.

### How does an antenna convert electromagnetic waves into a current?

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

### 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.

### What happens to light waves during reflection?

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.

### The source of electromagnetic waves?

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.

### Can waves with different wavelength be coherent?

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.

### When two waves meet and the result is a larger wave it is?

Reinforcement of waves that are in phase with eachother.

### How does power factor correction solve the problems caused by inductive loading?

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

### What causes waves to bend?

The friction of hitting the beach at an angle causes the waves to bend.

### What is it called when two waves collide and it increases the amplitude of the resulting wave?

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.

### What is coherent sound wave?

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.

### What are the reflection refraction diffraction?

* 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

### What is electrical phasing?

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

### What is the difference of compressional waves and transverse waves?

Th angle of vibration is 90 degrees different..

### What is longshore drift?

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.

### What happens to waves when they enter a denser medium at a angle?

They are refracted, and the new angle of travel appears as an increase to the initial angle of incidence.

### What type of interference occurs when two waves are in phase?

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

### What is the wavelength of DC current?

Unlike AC, which HAS waves, DC current is waveless- either on or off. No waves= no wave length.

### Why rms value of ac not peak value is used?

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