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In electrical circuits, reactance is the opposition presented to alternating current by inductance and capacitance. [1] Along with resistance, it is one of two elements of impedance; however, while both elements involve transfer of electrical energy, no dissipation of electrical energy as heat occurs in reactance; instead, the reactance stores energy until a quarter-cycle later when the energy ...
An inductive load consists of an iron-core reactive element which, when used in conjunction with a resistive load bank, creates a lagging power factor load. Typically, the inductive load will be rated at a numeric value 75% that of the corresponding resistive load such that when applied together a resultant 0.8 power factor load is provided.
It is helpful to associate changing electric currents with a build-up or decrease of magnetic field energy. The corresponding energy transfer requires or generates a voltage. A mechanical analogy in the K = 1 case with magnetic field energy (1/2)Li 2 is a body with mass M, velocity u and kinetic energy (1/2)Mu 2. The rate of change of velocity ...
The total reactance at the angular frequency therefore is given by the geometric (complex) addition of a capacitive reactance (Capacitance) = and an inductive reactance : =. To calculate the impedance Z {\displaystyle \scriptstyle Z} the resistance has to be added geometrically and then Z {\displaystyle Z} is given by
Inductive reactance = increases as frequency increases, while capacitive reactance = decreases with increase in frequency (defined here as a positive number). At one particular frequency, these two reactances are equal and the voltages across them are equal and opposite in sign; that frequency is called the resonant frequency f 0 for the given ...
Summation of the inductive and capacitive coupling coefficients is performed by formula [3] = + +. (8) This formula is derived from the definition (6) and formulas (4) and (7). Note that the sign of the coupling coefficient itself is of no importance. Frequency response of the filter will not change if signs of all the coupling coefficients ...
The operator "delta" (Δ) is used to represent a difference in a quantity, so we can write ΔV = V 1 − V 2 and ΔI = I 1 − I 2. Summarizing, for any truly ohmic device having resistance R , V / I = Δ V /Δ I = R for any applied voltage or current or for the difference between any set of applied voltages or currents.
Purely capacitive circuits supply reactive power with the current waveform leading the voltage waveform by 90 degrees, while purely inductive circuits absorb reactive power with the current waveform lagging the voltage waveform by 90 degrees. The result of this is that capacitive and inductive circuit elements tend to cancel each other out. [4]