# Why REactance does not add thermal noise?

# What are thermals?

A thermal is an area of rising air in the low heights of the Earth's atmosphere. Thermals are created by uneven heating of the Earth's surface from solar radiation, and an example of convection. The Sun warms the ground, which in turn warms the air directly above it

# What is a thermal?

Thermal is a type of scientific term used in science. It is usually connected with a word so as an example: thermal energy = a type of energy or thermal socks = warm socks. Eventually you'll notice thermal has almost always something to do with heat and temperature. If you want to know what Thermal …energy exactly is look up on this website .... all this asked for is " what thermal is" (MORE)

# What is inductive reactance?

Inductive reactance refers to the opposition that happens due tothe change of current which passes in an element. It isproportional to the inductance and sinusoidal signal frequency.

# What is reactance?

The electrical term reactance speaks to the "resistance" to AC in a circuit (though it isn't resistance) because of the presence of inductive and capacitive components in that circuit. Reactance can be either inductive or capacitive, and in each case we investigate, energy is taken from the circuit …and then returned to the circuit, but at different times. Additionally, in the case of inductive reactance, the energy is stored in the form of a magnetic field. In capacitance reactance, the energy is stored in the form of electric charge. When we consider the manner in which these two types of reactance operate, we might consider that they are actually complimentary. To cite a single example, when an inductor and a capacitor are in parallel in a circuit, they form a parallel tank circuit. In this circuit, the inductor and capacitor are taking energy and storing it, and then returning that energy back into the circuit at "opposite" times relative to each other. This allows the tank to "ring" or "oscillate" with a current circulating within the tank when it is at resonance. Links can be found below to begin investigating these phenomenon. Comment It might be better is reactance is equated to 'opposition' of a circuit, rather to its 'resistance'. The problem with the term 'resistance' is, that while (as in the above answer) it can be used in the sense of 'opposition', it has a very specific meaning in electrical engineering and, therefore, its use can be misinterpreted. (MORE)

# What is the reactance?

when we use the capcitor ristor and the inductor in any circuit including two of them the the total risistence of that circuit is known as reactance.

# What will happen to inductance if reactance increase?

Reactance increase means the value of the inductance is already increased because thease two factors are directly proportional to eachother. we can see from the formula ; inductive reactance xL =2(3.14)FL

# The unit of measure of inductive reactance?

The unit of measurement for inductive reactance ( X L ) is the ohm .

# If current increases then reactance will?

The reactance of any circuit element depends on the frequency of the alternating current flowing through it, unlike resistance which - except for certain components used at very high radio frequencies where the "skin effect" becomes important - is generally unaffected by the frequency. So, for mo…st practical electrical engineering applications, resistance is considered to be independent of the current flowing through it, but that cannot be said about all kinds of reactance because some types of components - inductors, for example - can get "saturated" if the current gets high enough. "Saturation" means that there is no further practical increase in an inductor's reactance after a certain level of reactance has been reached. Once saturation sets in, the reactance does not reduce, it just stays the same even though the current is made to increase. Saturation happens because a magnetic circuit exhibits "hysteresis", but that is a further topic which someone else may like to explain... (MORE)

# What does a solid become when you add thermal energy?

When thermal energy is added to a solid, it will cause an endothermic reaction to occur, which changes the solid to a liquid, or, in the case of an extreme temperature change, a solid to a gas..
Or it might just get warmer, as when the sun warms a block of concrete.

# What happens to an ice cube when you add thermal energy?

It will melt! But you have to add enough energy to equal the latent heat as well as to bring the ice up to the freezing point, if it is in a freezer to start it will be at about -21degC.

# What are the equations used to find the inductive reactance and the capacitive reactance?

X c(capacitive reactance) = 1/(2piFC) X L(inductive reactance) = 2piFL Where pi=3.14etc., F=frequency and C and L are capacitance and inductance. Please pardon lack of proper symbology.

# Is it possible to add thermal energy to a substance and not raise its temperature?

Thermal energy is simply just another term for temperature. Adding thermal energy to any substance will always create a rise in temperature. The only way it would be possible to add thermal energy to a substance without seeing any net increase in temperature would be if the substance lost an equal a…mount of thermal energy at the same time. Answer: At the melting point and boiling point any input of thermal energy goes to the change of state rather than the rise in temperature. As a consequence boilling water stays at 100 o C until it is all evaporated and melting ice stays at 0 o C until the entire mass is melted (MORE)

# What does a liquid become when you add thermal energy?

In other words if you add heat to a liquid it definitely becomes a gas.

# If you add enough thermal energy a material may change its?

First, it'll change it's temperature, and with this comes change in size, usually expansion. Then it can change its physical properties, it can become softer, or harder. Next you may change its phase: If you're starting out with a solid, it may melt to liquid phase; a liquid may go to gas phase;… a gas may go to plasma phase. Or, if oxygen is available, eventually it may start to burn. Or, depending on the material, which could well be a mixture of different molecules, these might interact with each other, or they might fragment into smaller molecules. (MORE)

# How can you add thermal energy to a substance without increasing the temperature?

You can add thermal energy to a substance without increasing its temperature by adding hot water . As the thermal energy of the substance increases, the particles of the substance expands. That is how you can open a bottle by putting it under hot water.

# Inductive reactance has a unit in?

Ohms, resistance in an inductor increases as the frequency of the AC signal increases, this "artificial resistance" is called impedence, and it is measured in ohms

# What is reactance modulator?

A Reactance Modulator .
A reactance modulator changes the frequency of the tank circuit of the oscillator by changing its reactance. This is accomplished by a combination of a resistor, a condenser, and a vacuum tube (the modulator) connected across the tank circuit of the oscillator as in Fig. 3…3 A, and so adjusted as to act as a variable inductance or capacitance..
Fig. 33 A. Principle of a reactance modulator .
The net result is to change the resonant frequency of the LC circuit by amounts proportional to the instantaneous a.f. voltages applied to the grid of the modulator tube, without changing the resistance of the LC circuit or the amplitude of the oscillations. A modulator circuit is shown in Fig. 33 B..
Fig 33 B. A reactance modulator .
The voltages supplied to both the modulator and oscillator must be carefully stabilized to prevent undesired frequency changes. The speech amplifier (Fig. 33 A) does not have to deliver any power and need supply only a small output voltage, say 10 or 15 volts. A pentode and triode, R-C coupled, will be sufficient even with a sensitive microphone and a high-powered oscillator. The frequency change of LC per volt change on the a.f. grid of the modulator tube will be greater when C 1 ,Fig. 33 B, is made smaller. The blocking condenser C 2 has a comparatively high value, and hence offers but small reactance to r.f. currents..
Fig. 19 H. An RC phase shifter.
In Fig. 33 B, the radio-frequency voltages which are developed across the tank in the oscillator circuit also appear across the RC 1 circuit and across the parallel 6L7 modulator tube. Now look up the phase-shifting circuit of Fig. 19 H. The resistance r has been replaced by the internal resistance of the modulator tube of Fig. 33 B. The voltage drop across C 1 is 90Â° out of phase with the tank voltage. It is applied to the control grid of the 6L7 whose r.f. plate current responds in the same phase. Thus this current is made to lag 90Â° behind the tank voltage. The r.f. plate current flows through the tank circuit and, combined with the current therein, is equivalent to a new current whose phase differs from the normal value just as though an additional reactance (not resistance) had been connected in with L and C. This, of course, changes the frequency of the LC circuit and hence of the transmitter. When a.f. is fed into the modulator tube, it causes proportionate changes in the r.f. plate current and hence in the equivalent reactance of the LC circuit. (MORE)

# Inductive reactance is equal to capacitive reactance?

yes,they are equal at only one condition i.e. when the circuit containing R,L and C in series or in parallel behave as a purely resistive circuit. This condition occur only at resonance.

# What is the difference between inductive reactance and capacitive reactance?

The difference between inductive reactance and capacitive reactance is that the former is a characteristic of inductors, and the latter a characteristic of capacitors. Also, the former is a function of the buildup and collapse of a magnetic field, while the latter is a function of the buildup of ele…ctric charge, and its discharge. Both phenomenon talk about the storage of energy taken from a circuit, and about giving it back -- and at different times during the operation of the circuit. Links are provided below to check facts and learn more. (MORE)

# What is an reactance?

it is a internal resistance of the devices like as capacitor and inductor Comment As 'resistance' has a very specific meaning, I suggest that the above answer should read: 'It is the opposition of devices like capacitors and inductors (to the flow of current).'

# What is the symbol for inductive reactance?

Inductive reactance does NOT have it own sign or symbol. Rather, it uses Ohms as a quantifier. But Capacitive reactance ALSO uses Ohms as a quantifier. Fortunately, 1 Ohm of Inductive reactance is cancelled by 1 Ohm of Capacitive reactance at the same frequency of measurement.

# What is the definition of an inductive reactance?

Opposition to the flow of AC current produced by an inductor. Measured in Ohms and varies in direct proportion to frequency.

# Why thermal noise is called white noise?

Thermal noise occurs due to the motion of millions of electrons in a object. Due to the central limit theorem, the total effect can be modeled as a Gaussian distributed random variable with zero mean and N_0/2 variance.

# What is capacitance reactance?

when ever current passing through any two parallel transmission line than due to the dieletric property of conductor some what capacitance effect will be generate between them that phenomina called as capitance reactance/////////////////// that symply we can called capitance reactance is measure of …capitance The reactance of a capacitor is its resistance. (MORE)

# The reactance of a capacitor is proportional to?

inverse of frequency Answer Reactance is inversely -proportional to frequency of the supply, and the capacitance of the capacitor.

# What is synchronous reactance?

Synchronous Reactance (in a generator analysis domain) is and equivalent series per-phase inductance term (think per-phase winding resistance) and is mainly composed of the machine's per-phase leakage inductance (equivalent series inductance of primary and secondary flux leakage) and armature reacti…on (distortion in flux introduced by an armature current in a machine, once again on a per-phase basis; described as a series inductance). L_SyncReac=L_leakage+L_ArmatureReaction. That sort of touches the surface of synchronous reactance. (MORE)

# Thermal noise power in a conductor is proportional to?

Thermal noise is the noise generated by thermal agitation of electrons in a conductor. The noise power "P" in Watts , is given by "P=KTB" . The movement or agitation of atoms in conductors and resistors is somewhat random and determined by the temperature of the conductor or resistor. The random mo…vement of electrons is brought about bythermal agitation of the atoms that tends have increased energy as the temperature rises. This random movement gives rise to electrical voltages within the circuitry known as either, thermal noise, resistor noise, Johnson noise or circuit noise. This noise is existent across the frequency spectrum, meaning the more bandwidth occupied the likelihood of greater exposure. Example: K = Boltsmans Constant = 1.3807x10^-23 T = Temperature (Kelvin) = 273K + 20 Âº C B = Bandwidth (Hz) = 180x10^3 Noise Power = K x T x B (MORE)

# The formula for reactance?

capacitive reactancE Xc =1/2*pi*f*c where, Xc = reactance pi= 3.14 f= frequency of supply c= capacitance

# What is the reactance theory?

In electrical circuits, reactance is roughly the equivalent in AC circuits to what resistance is in DC circuits. But the reactance of a capacitor or an of an inductor varies with the applied frequency. Impedance is the expressed measure, and it will be quoted in Ohms.

# What factors affect the reactance of a capacitor?

Reactance (in ohms) = 1 / (2 pi * capacitance *frequency) . Capacitance is in farads. Frequency is in Hertz( cycles / second ). So increasing capacitance or increasing frequency will decreasereactance.

# What is the reactance of a rheostat?

In theory, a rheostat has only resistance. It lacks any capactive or inductive properties, and, therefore, has no reactance. In practice, a rheostat, which is like a potentiometer without a "third" terminal. One of the ends (terminals) of a potentiometer, if it is removed entirelym will leave a two-…terminal device called a rheostat, or variable resistor. In practice, all similar devices have some distributed capacitance and inductance associated with them. The construction of the device as well as the materials out of which it is made (as well as the operating frequency) will determine how much reactance the device has. (MORE)

# Why are there creaking noises in attics of old houses on cold nights in terms of thermal expansion?

The floor boards contract when it gets cold.The noises you hear are the floor boards contracting.

# What is relationships of capacitive reactance to resistance?

The relationship of capacitive reactance to resistance is because capacitive reatance is the resistance of the capacitor.

# What is percentage reactance?

Percentage reactance of a transformer (or in general, a circuit) is the percentage of phase voltage drop when full load current flows through it, i.e %X=(IX/V)*100. Now Short Circuit Current is V/X So short Circuit current is I*(100/%X).

# How do you compute capacitive reactance?

X c =1/(2*pi*f*C) where X c = capacitive reactance in ohms f = frequency in hertz and C = capacitance in farads

# How can capacitive reactance be calculated?

it depends on capacitance and frequency, both inversely. Check your AC circuits textbook for the exact equation.

# When you add thermal energy to a system what will happens to the kinetic energy of the molecules within the system?

if you add a thermal energy to a system then it will happens nothing because u dont no anything

# What is the value of capacitive reactance for DC?

Capacitive reactance Xc is equal to 1/2pi*f*C, wher f is input frequency and C is capacitance. Since for DC frequency is zero(no variation with time) Xc is infinite ideally and very very high practically.

# What is difference between impedance and reactance?

Impedance is the net reactance(for Capacitors and inductors in the circuit) / Resistance of the circcuit whereas reactance is the prperty of the individual passive components ( only capacitors n inductors) to resist the flow of charge.

# Why must you add the resistance and reactance of a circuit in series by the phythagorean method in order to find the total impedance?

The resistance and reactance of an a.c. load are determined from the phasor diagram for that load. A phasor diagram is very similar to vector diagram, and represents the voltage drop across the resistive component of the load as being in phase with the load current, and the voltage drop across the… reactive component as lagging the load current by 90 degrees. The vector sum of these two voltage drops will equal the value and phase-relationship of the supply voltage. If we now divide each of these three voltages by the supply current, we will converted the phasor diagram into what is called an ' impedance triangle ', in which the resistance is represented horizontally, the reactance is represented vertically, and the impedance is represented by the resulting hypotenuse. So, to find the hypotenuse (i.e. the impedance) we must use Pythagoras's Theorem to vectorially-add the horizontal (resistance) and vertical (reactance) components. (MORE)

# What is synchronous reactance in alternator?

The overall reactance of the armature winding is thesum of its leakage reactance plus fictitious reactance, which isknown as synchronous reactance (X s ). Xs=X L +X ar where X L and X ar are inÎ©/phase. Therefore, X s is in Î©/phase. The impedance of armature winding is obt…ained by combining itsresistance and its synchronous reactance. (MORE)

# What is inductance reactance?

There is no such term as 'inductance reactance'; the correct term is ' inductive reactance '. This is the opposition to the flow of a.c. current, due to the inductance of the load, and the frequency of the supply, and is measured in ohms. Inductive reactance is directly proportional to both the sup…ply frequency and the load's inductance. (MORE)

# Why DC motor does not have reactance?

Reactance is a result of inductance. Inductance is a result of a changing magnetic flux cutting a wire or let say, a coil, or, a result of a moving conductor cutting a magnetic field. DC motors are inductors i.e they have reactance. This happen as soon as the armature starts rotating. The armature …is moving in the magnetic field of the field windings thus an emf is induced in them as the armature conductors start cutting the field. It's this emf that limits the armature current once the motor is in motion. (MORE)

# How do compute the reactance in an inductive circuit?

Inductive reactance, X L , in ohms, is given by: X L = 2 pi f L where : f = frequency (Hz) L = inductance (H)

# Why is reactance imaginary?

The reactance is taken imaginary because it does not consume anypower directly but reactance like inductive or capacitive reactanceprovides phase shift of 90 degree, whether it provides a leadingphase shift or lagging phase shift. In case of inductor the currentlags voltage by 90 degree while in cas…e of capacitor current leadsby 90 degree. Thus only resistance is taken as real whilecombination of resistance and capacitance is called impedence.... Ashish Sharma AP ECE HIET Shahpur (MORE)

# How can you add thermal energy to a substance without increasing its temprrature?

That happens when there is a phase transition; for example, when ice melts, it takes energy to convert ice at zero degrees, to water at zero degrees.

# What is percentage reactance of a power system?

If the load on an AC system is purely resistive, then the voltageand current waveforms will be in phase. A desirable state. When the load has some reactance, then these two parts of the powersignal will not be in phase; and this results in an inferior powergeneration, in which some of the work neede…d to generate the signalis not available as real work at the terminus. This undesirablecondition occurs with both inductive loads such as electric motors,and capacitive loads, such as fluorescent lighting. This may be corrected for in real-life systems by employing 'powerfactor' correcting equipment. One common device is the 'rotarycapacitor' - in reality, a rotating transformer in which the phaseis controlled as to make it appear as a capacitor, not as aninductor. Ordinary transformers transfer the reactance of their load, with asmall percentage of genuine reactance due to hysteresis losses inthe core of the transformer. (MORE)

# Why reactance does not oppose DC?

An ideal inductor does not oppose the steady flow of currentbecause it has no resistance. But it opposes changes in the currentand the voltage across the inductor is the rate of change ofcurrent (in amps/second) times the inductance in Henrys, which ishow inductance is defined. So when a battery is… connected across an inductor the initial rateof rise of the current is V/L amps/sec, where L is the inductance,and it continues to rise until limited by any resistance in thecircuit. (MORE)

# What heppens to matter when you add thermal energy?

When you add thermal energy to matter, either the temperature will increase, or there will be a change in the state (phase) of matter, for example when ice melts.

# What is inductive reactance-?

Inductive reactance is a term used in electrical fields. It is anopposition in an element to the change of current.