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A.C capacitor
AnswerGenerally speaking power-factor capacitors are oil-impregnated paper capacitors -i.e. capacitors whose dielectric is manufactured from oil-impregnated paper. Power-factor capacitors are rated in reactive volt amperes, rather than in farads.
There is no such thing as an 'AC capacitor', as all capacitors (other than polarised capacitor) can operate on either AC or DC.
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Velocity factor depends to a large extent on the dielectric (insulation) used. You will have to specify the exact cable to answer this question.
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The area of the sheets, the distance between them, and the material between them.
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For an insulating material dielectric strength and dielectric loss should be respectively
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The dielectric material between the plates.
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The velocity factor is the speed at which an RF signal travels through a material compared to the speed the same signal travels through a vacuum. The velocity of propagation is inversely proportional to the dielectric constant. Lowering the constant increases the velocity.
Generally, the higher the velocity factor, the lower the loss through a coaxial cable.
General Rules for Coaxial Cable
D = diameter of insulation under the shield
d = diameter of inner conductor.
Velocity Factor, Velocity of Propagation, Vp
The higher the velocity factor, the lower the loss through the cable.
Raising the D/d has no effect on Vp
Raising the dielectric constant lowers Vp
Capacitance
Raising the D/d ratio lowers capacitance
Raising the dielectric constant raises capacitance
Impedance Raising the D/d radio raises impedance
Raising the dielectric constant lowers impedance
Attenuation or Loss
Raising the D/d ratio lowers attenuation
Raising the dielectric constant raises attenuation
So in simpler terms the larger amount of dielectric between the center conductor and sheath equals less loss in RF. Trunk cables have less loss than feeder legs.
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Output Power divided by Power Factor.
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There is no disadvantage of unity power factor, because at unity power factor all the electrical power is efficiently utilized by the the load, and at lagging power factor some power is lost in the load's magneticfield.
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When looking at power factor, it is the ratio of watts (true power) to VA. The power factor is how we measure power systems. A person with a low power factor like .26 will have a higher electricity bill.
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There is no such thing as a 'low power-factor' wattmeter. A wattmeter always reads true power, regardless of the load's power factor.
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The dielectric,usually the insulator between the plates of a capacitor, can be overstressed by the application of too high voltages applied to the capacitor plates. The dielectric breaks down and a current flows between the plates until,either they are discharged, or an equilibrium is reached,below the working voltage of the capacitor. If the dielectric is damaged in this process he capacitor must be replaced. Some dielectric material self heal and can recover from an over voltage.
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dielectric constant for sodium Hypochlorite
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Capacitors are named after their dielectrics. So, an 'air capacitor' uses air as its dielectric, a 'mica capacitor' uses mica as its dielectric, and so on. There are lots of different dielectric used to separate the plates of a capacitor, each with different permittivities and dielectric strengths. As the perfect dielectric (i.e. one with both a very high permittivity and a very high dielectric strength) doesn't occur, the choice of dielectric is always a compromise between it permittivity and dielectric strength.
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Power factor refers to the cosine of the phase angle between voltage and current in an AC circuit, representing the real power divided by apparent power. Displacement factor, on the other hand, specifically refers to the cosine of the phase angle between fundamental voltage and fundamental current in power systems, excluding harmonic components. Essentially, power factor is a broader term that includes displacement factor as a specific case.
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Power factor is an AC only term, and has no meaning for DC.
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A leaky dielectric is a poorly conducting liquid. Refer to "ELECTROHYDRODYNAMICS: The Taylor-Melcher Leaky Dielectric Model" for more information.
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The 0.8 Power Factor provided by generator manufacturers is not the load power factor, but it is the nominal power factor used to calculate the kW output of an engine to supply the power for a particular alternator kVA output. Alternators are therefore designed to supply their rated kVA at 0.8 lagging power factor.
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Power factor can be unity. If the load is purely resistive, then the load current and supply voltage are in phase, and the load will have unity power factor.
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high and high
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No, these are two unrelated properties of a material.
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The dielectric breakdown strength is 3,000 volts per millimeter.
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A wattmeter reads the true power of a load, regardless of its power factor.
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power factor meters are connected across the supply
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There's no special significance to a power factor of 0.82.
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The capacitance will increase. When the volume is filled with a material with a dielectric constant greater than 1, the capacitance of the capacitor increases by a factor equal to the material's dielectric constant. This is because the electric field is effectively reduced within the material, allowing more charge to be stored for the same voltage.
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The ratio of active power (real power) and apparent power is called power factor
( pf ).
Power Factor ( pf ) = Active Power / Apparent Power
= .................. ( kvar )
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Power factor is defined as the ratio of real power over total power. Total power is the vector sum of real and reactive power.
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Yes. Once dielectric breakdown occurs the circuit is now completed through a conductive breakdown channel in the dielectric. The current injected in one end of the dielectric is matched by the current coming out of the other end.
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The power factor depends on the properties of the load, and if any power factor correction is done it has to happen at the load, so that the current in the transmission lines is reduced. Correcting the power factor at the sending end fails to address the problem.
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ratio between true power and apparent power is called the power factor for a circuit
Power factor =true power/apparent power
also we conclude PF=power dissipated / actual power in pure resistive circuit
if total resistance is made zero power factor will be zero
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A resistor doesn't have a power factor. However, if a circuit is pure resistance in nature the power factor will be one when a voltage is applied and a current flows in the circuit. The power factor is a measure of the relative phases of the current and voltage in a circuit.
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Usually for a power factor lower that 90% a service charge will be added to the monthly electrical bill. On power factor correction calculations try to get the power factor up to 95%.
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Per factor is 1 when reactive power is zero.
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yes power capacitar ust inprove the power factor and sae the kvah reding
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boundary conditions for perfect dielectric materials
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The electric field is weakened when a dielectric is inserted.
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Electrolytic capacitors use aluminium as a dielectric.
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The dielectric constant varies, depending on the material.
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If a load takes 50 kW at a power factor of 0.5 lagging calculate the apparent power and reactive power Answer: Apparent power = Active power / Power Factor In this case, Active power = 50 kW and power factor = 0.5 So Apparent power = 50/0.5 = 100 KVA
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