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What is the reactance of a 25 uf capacitor when the applied frequency is 400 hz?
Wiki User
∙ 12y ago
Reactance is -1/2 pi F C so a 25 uF capacitor at 400 Hz would have a reactance of about -15.9 ohms. The negative sign indicates that capacitive reactance is leading, with current leading voltage.
AnswerI would take issue with the previous answer that capacitive reactance is expressed as a negative value, or that it is 'leading'. Reactance is not a vector quantity, so it neither leads nor lags anything. In a (theoretically) purely capacitive circuit, it is the load current that leads the supply voltage. However, when using complex notation, capacitive reactance is expressed as -j 15.9 ohms, where 'j' is called an 'operator' -but even this does not mean that the reactance is 'leading', as it defines reactance in terms of a current phasor -in other words, the '-j' refers to the relative position of current to voltage, not reactance to impedance.
Wiki User
∙ 12y ago
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How much voltage does a resistor drop in a circuit with 20 volts 1kHz capacitor at 0.47 milli Farads and a 400 ohm resistor?
The reactance of the capacitor is 0.339 ohms, therefore the total impedance is sqrt(4002+0.3392) = 400.0001 ohms. So the resistor drops very nearly 20 volts, very slightly less.
How many current drawn in 400 kvar capacitor bank?
It depends upon at how much voltage level 400 kvar capacitor bank is used.
How do you calculate capacitance to improve power factor in a industry?
A capacitor used to correct a lagging power factor has to take the right number of VAR (volt-amps reactive). If you have a load of W watts with a power factor of P, the total VA (volt-amps) is W/P. For example a 400 watt load with a power factor of 0.8 draws 500 VA because 400/0.8=500. The basic formula is that W2 + (VAR)2 = (VA)2 The VAR comes from this formula: VAR = sqrt((VA)2 - W2) So for the 400-watt load with a 0.8 power-factor, which draws 500 VA, the VAR is equal to 300. On a 120 v supply the capacitor must draw 300/120 amps, or 2.5 amps, and its reactance is therefore 120/2.5 or 48 ohms. The capacitance comes from this formula: 1 / (2pi times frequency times reactance). On a 60 Hz system this is 1 / (377 times reactance) So for a 48 ohm reactance the capacitance is 0.0005526 Farad or 55.3 microfarads. This would completely correct the power factor in the example and the current drawn would come down from 4.16 amps to 3.33 amps, which would reduce the power lost in the supply wiring by 34%.
Why is 400 Hz used as an aircraft power supply?
Although most all utility power in the world use either 50 Hz or 60 Hz, 400 Hz power systems are typically used in large aircraft. The reason for the higher frequency is that most of the power system parts, especially the 400 Hz alternator and 400 Hz motors are much smaller compared with similar 60 Hz equipment of the same power rating. In aircraft, every pound saved in equipment weight, equates to about a five pound savings in gross weight during flight. When equipment weight is reduced, both airframe structure and fuel load can also be reduced. As flux is inversely proportional to speed and speed is proportional to frequency Higher the frequency lesser the flux required.Lesser the flux,lesser the core size.Lesser the size means less weight.Hence the pay load can be increased. Also frequency above 400 hz not taken because the radiation takes place beyond this.
What is the frequency of a police radio?
Basically it is a push to talk service.Where one can talk only(transmitter) and other are listen(receiver).When any one push the button then he only can talk.The range of this type of communication is 200-500 meter.Frequency range is 400-2700MHz. Frequency Range (UHF): - Channel 1, 400-420MHz - Channel 2, 430-450MHz ... Communication Range: 5KM+ .Push-to-talk cellular calls are half-duplex communications .Written by Kapil Sadhu.
How much voltage does a resistor drop in a circuit with 20 volts 1kHz capacitor at 0.47 milli Farads and a 400 ohm resistor?
The reactance of the capacitor is 0.339 ohms, therefore the total impedance is sqrt(4002+0.3392) = 400.0001 ohms. So the resistor drops very nearly 20 volts, very slightly less.
How many current drawn in 400 kvar capacitor bank?
It depends upon at how much voltage level 400 kvar capacitor bank is used.
If a coil has 100 microhenries inductance at 400 hertz what is it's reactance?
The reactance of an inductor is calculated as Xl = 2πfL, where Xl is the inductive reactance, f is the frequency, and L is the inductance. Substituting the given values of 100 microhenries for inductance and 400 Hz for frequency into the formula gives Xl = 2 * π * 400 * 100 * 10^-6 which equals approximately 251.3 ohms.
How much resistance must be connected in series with a 250 ohms inductive reactance to produce a total ciruit impedance of 400 ohms?
how much resistance must be connected in series with a 250 ohms inductive reactance to produce a total ciruit impedance of 400 ohms?
Frequency of red?
Frequency of red is around 400 Terahertz.
Why you use 400Hz frequency instead of 60Hz?
50 Hz has an edge over 60 Hz as it will have less skin effect and therefore line resistance will be less. Therefore, voltage drop as well as unwanted loss of energy in the line will be less. That means dip in supply voltage at user end will be less and efficiency will be more.AnswerThe difference in 'AC resistance' due to the effect of skin effect between 50/60 Hz is insignificant, just as the increase in inductive reactance, or the decrease in capacitive reactance is insignificant.The answer to your question is that the two frequencies simply resulted from the independent development of electricity distribution networks in different parts of the world, and there is no inherent advantage of one frequency of the other.Transformers for 60 Hz are smaller than for 50 Hz, assuming a given power rating. That is because the iron magnetic core can be reduced in size by 20% for 60 Hz, for the same peak magnetic flux density.
What is the frequency range of bear?
400-16000
What is the frequency of ultra violet?
400 HZ
What is the wave frequency for 400 nanometers?
7.5*
How do you calculate capacitance to improve power factor in a industry?
A capacitor used to correct a lagging power factor has to take the right number of VAR (volt-amps reactive). If you have a load of W watts with a power factor of P, the total VA (volt-amps) is W/P. For example a 400 watt load with a power factor of 0.8 draws 500 VA because 400/0.8=500. The basic formula is that W2 + (VAR)2 = (VA)2 The VAR comes from this formula: VAR = sqrt((VA)2 - W2) So for the 400-watt load with a 0.8 power-factor, which draws 500 VA, the VAR is equal to 300. On a 120 v supply the capacitor must draw 300/120 amps, or 2.5 amps, and its reactance is therefore 120/2.5 or 48 ohms. The capacitance comes from this formula: 1 / (2pi times frequency times reactance). On a 60 Hz system this is 1 / (377 times reactance) So for a 48 ohm reactance the capacitance is 0.0005526 Farad or 55.3 microfarads. This would completely correct the power factor in the example and the current drawn would come down from 4.16 amps to 3.33 amps, which would reduce the power lost in the supply wiring by 34%.
What is the frequency range of visible radiation?
The frequency range for visible light is 400-790 THz
What is a high frequency word?
High Frequency means , frequency which is at the upper threshold for any system meaning if the average is 200 , lower limit is 100 and the upper limit is 400 then , 400 wud be the high frequency according to the given system requirement.These basics are applicable in any scenerio.
