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An ideal inductor does not oppose the steady flow of current because it has no resistance. But it opposes changes in the current and the voltage across the inductor is the rate of change of current (in amps/second) times the inductance in Henrys, which is how inductance is defined.
So when a battery is connected across an inductor the initial rate of 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 the circuit.
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What does capacitive reactance oppose?
Inductive reactance.
Does any capacitor block ac?
It is the capacitive reactance of a capacitor that causes it to oppose the passage of a.c. current. Since capacitive reactance is inversely-proportional to frequency, the lower the frequency, the greater its reactance, and the more it will oppose the flow of a.c.
What forces can oppose current flowin an ac circuit?
Resistance, capacitive reactance, inductive reactance. Note: None of this is really a "force" - not in the meaning of "force" as used in physics.
Why is there no inductive reactance in DC circuits?
Inductive reactance is a resistance by inductors to the change of current flow, and is dependent on the frequency at which the current oscillates. DC current flows in only one direction so an inductor's impedance remains the same.
What is difference in resistance and reactance?
Resistance is a concept used for DC. the current through a resistance is in phase with the applied voltage Reactance is used for AC the current through a inductive reactance lags the applied voltage by 90 degrees. the current through capacitive reactance leads the applied voltage by 90 degrees. the net reactance is the difference between inductive and capacitive reactance
Why capacitor will not block ac source?
A capacitor will oppose the flow of a.c. due to its capacitive reactance (Xc), expressed in ohms.The capacitive reactance for a given capacitor is inversely-proportional to the frequency of the supply; in other words, the higher the frequency, to lower the capacitive reactance.
What is the opposition to the current flow?
resistance is the opposition to the flow of electric charge
Why inductor and capacitor works only for alternating currents?
Actually they work fine for both AC and DC, its just that DC is the limiting case where the inductive reactance falls to zero and the capacitive reactance rises to infinity.The other limiting case is infinite frequency (but of course this is not reached in practice, but if it could they work fine too) where the inductive reactance rises to infinity and the capacitive reactance falls to zero.
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.
Does reactance increase with an increase in inductance?
Inductive reactance case of ac) is equivalent to resistance (in case of dc) for inductors.So if resistance increases current decreasesas well as if inductive reactance increases current decreases
Will an inductor work on DC?
An inductor cannot work in dc because the frequency is zero there by making the inductive reactance zero as a consequenceAnswerOf course an inductor can work in a d.c. circuit!
Why does an inductor block AC but allow DC?
While it is true that an inductor opposes the flow of an alternating current, it does not necessarily 'block it'. The quantity that opposes the flow of an AC current is the inductor's inductive reactance, expressed in ohms. Inductive reactance is proportional to the frequency of the supply voltage and, at 50 or 60 Hz, the reactance of a transformer's winding is relatively low (although very much higher than its resistance) and, while this acts to limit the amount of current flow, it certainly doesn't act to block that flow.
