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How do you choose the value of resistor and capacitor in order to maintain the desired cut-off frequency?
Wiki User
∙ 16y ago
By altering the time constant (CxR) in such a way that there is little distortion. To ensure minimum distortion, CR should be much greater than 5 to 10 times that of T. C is capacitance in farads, R in ohms and T in seconds. For detailed knowhow on this matter, you may consult low pass/ high pass/ band pass filter designing.
Wiki User
∙ 16y ago
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Why are capacitors required to be in capacitor banks?
Capacitor banks are used to control the power factor in a power system. By connecting suitable capacitors the power factor can be controlled / maintained at a desired level. The requirement of a capacitor changes as the load changes dynamically. The same amount of capacitors can not maintain the desired power factor all the time. To be able to connect only the required number of capacitors, multiple (bank of capacitors) capacitors are included in a system. An automatic controller senses the actual power factor and connects and disconnects the capacitors from the bank as required
Which filter do you use to remove pulsations from a power supply output?
There is no answer to this. If a power supply pulsates, what frequency, etc. If a power output needs filtering there are oodles of ways to do it depending on the desired result and the starting conditions. A starting point is a big capacitor.
What is the Relationship beteen Capacitance and frequency?
AnswerThe short answer to the question is the capacitive reactance of a capacitor in a DC circuit is infinite.In a DC circuit, disregarding transient behavior and any leakage effects, a capacitor is effectively an open circuit, and so its reactance is essentially infinite.Capacitive reactance is calculated as Xc =1/(jwC) where w is the angular frequency in radians per second, w = 2*pi*f, C is in Farads, and f is in Hertz.With DC, both f and w are zero, and, theoretically, the formula,Xc =1/(jwC) = limw-->0 [1/(jwC)] becomes infinitely large. In any practical circuit, however, there is always some leakage, so the impedance of the a capacitor will be quite large, on the order of megohms, but still finite.
What is a wobbulator?
A frequency-modulated oscillator is usually called a sweep generator today, but in 1935, it was called a wobbulator.The first wobbulators used a motor-driven variable capacitor to sweep (or wobble) through the desired frequency range. Later circuits used a Phantastron oscillator that worked well, but still had no good way to add markers.
Why do you use a capacitor in fans?
Due to the type of motor used in a fan. The capacitor provides a phase shift between the stationary winding and the rotating winding, which is necessary to get the desired torque.
What is the function of the resistor into capacitor?
A RC circuit is a simple filtering circuit. The impedance of R will stay the same across the frequency band. The impedance of C will vary according to 1/jwC (j = i = imaginary number, w = omega/frequency in radians, C = capacitance in Farads). As frequency varies from low frequency to high frequency, an increasingly smaller amount of the signal voltage will "drop" across the capacitor. This is known as a first order (one reactive element, the capacitor) low pass filter if the desired signal is measured across the capacitor. If measured across the resistor, this would be a first order high pass filter. Edit: if you are talking about ESR (equivalent serires resistance), it is a parasitic component inside a capacitor. Theoretically, you don't want it but it's there.
What is the use of resistors in a circuit?
One use is as a current limiter. For example if a certain device (like a capacitor) is capable of being in conditions similar to a short circuit, the amount of current "drawn" by the capacitor could be damaging to it or other components. Placing a resistor in series with the capacitor means that you can select the proper resistor so that at maximum capable volt, you know the maximum current that will flow through that value resistor according to Ohms Law. Another use is to design to have a desired voltage present in certain parts of the circuit.
Why are capacitors required to be in capacitor banks?
Capacitor banks are used to control the power factor in a power system. By connecting suitable capacitors the power factor can be controlled / maintained at a desired level. The requirement of a capacitor changes as the load changes dynamically. The same amount of capacitors can not maintain the desired power factor all the time. To be able to connect only the required number of capacitors, multiple (bank of capacitors) capacitors are included in a system. An automatic controller senses the actual power factor and connects and disconnects the capacitors from the bank as required
What work resistor?
when a resistor is connected in a circuit it drop some voltage across it.when a circuit have large input voltage then by using a resistor of suitable value we get the desired voltage.
Which filter do you use to remove pulsations from a power supply output?
There is no answer to this. If a power supply pulsates, what frequency, etc. If a power output needs filtering there are oodles of ways to do it depending on the desired result and the starting conditions. A starting point is a big capacitor.
What is the Relationship beteen Capacitance and frequency?
AnswerThe short answer to the question is the capacitive reactance of a capacitor in a DC circuit is infinite.In a DC circuit, disregarding transient behavior and any leakage effects, a capacitor is effectively an open circuit, and so its reactance is essentially infinite.Capacitive reactance is calculated as Xc =1/(jwC) where w is the angular frequency in radians per second, w = 2*pi*f, C is in Farads, and f is in Hertz.With DC, both f and w are zero, and, theoretically, the formula,Xc =1/(jwC) = limw-->0 [1/(jwC)] becomes infinitely large. In any practical circuit, however, there is always some leakage, so the impedance of the a capacitor will be quite large, on the order of megohms, but still finite.
What is a wobbulator?
A frequency-modulated oscillator is usually called a sweep generator today, but in 1935, it was called a wobbulator.The first wobbulators used a motor-driven variable capacitor to sweep (or wobble) through the desired frequency range. Later circuits used a Phantastron oscillator that worked well, but still had no good way to add markers.
what is a frequency converter?
A frequency converter is a power electronic device. It transforms Direct current to Alternating current of desired frequency and magnitude.
What happens to the resistor when there are more components?
Nothing happens to the resistor other than it may interact with the other components so as to perform a desired function.
Why do you use a capacitor in fans?
Due to the type of motor used in a fan. The capacitor provides a phase shift between the stationary winding and the rotating winding, which is necessary to get the desired torque.
Why would you use a resistor?
The resistor is used in a electric circuit normally: 1)To increase or decrease the ac/dc current in any electric current path. 2)To obtain variable ac/dc voltages from a fixed ac/dc voltage using multiple resistors. 3)To vary the timing or frequency (pitch in music) in conjunction with a capacitor. 4)Controlling the volume of sound in speakers is done by varying resistances somewhere in the amplifier stages is a good example. The capacitor is used in a circuit normally (few examples): 1)In AC to DC converters (rectifiers) and to eliminate any ac component in any dc voltages (to get smooth dc voltage) 2)To filter out unwanted frequencies interfering in a desired frequency of signal for example ECG, EEG, PPG in medical field. 3)Tuning to a particular frequency (in other words 'station') in radio receiver in conjunction with inductance coils. 4)To vary the time in a timer circuit in conjunction with resistor. Hope this information will be of help to you to some extend.
What is a formal way to increase the frequency of desired behaviors and decrease the frequency of undesired behaviors?
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