When you turn on a switch between a battery and capacitor, there is an inrush of current, but we measure zero volts across the cap because it is effectively shorted at this instant. As the cap charges, current drops and voltage rises. When it's fully charged, the voltage is max, and no more current flows.
If we put AC across the cap, it does this every half cycle. Max, current, zero volts, building up to max voltage, zero current. Then it does this for the other half cycle.
If we plot this on a graph, the voltage goes from zero to max at the same time current goes from max to zero. We say that "The voltage lags the current". Do this over several cycles and you'll have a sine wave for voltage and cosine wave for current. Sine and cosine are 90 degrees out of phase.
Here's more information: http://www.allaboutcircuits.com/vol_2/chpt_4/2.html
it will improve the power factor... The angle between voltage and current will decrease depends on capacitor value.
When a capacitor discharges the discharge current flows in the opposite direction to the current used to charge it.
What happens to the current in a circuit as a capacitor charges depends on the circuit. As a capacitor charges, the voltage drop across it increases. In a typical circuit with a constant voltage source and a resistor charging the capacitor, then the current in the circuit will decrease logarithmically over time as the capacitor charges, with the end result that the current is zero, and the voltage across the capacitor is the same as the voltage source.
by using capacitor on the line we can reduce spike current or we can use a capacitor bank for the rated line capacity.
The effective resistance of the capacitor reduces the ripple current through the capacitor making it less effective in its function of smoothing the voltage. But if the capacitor filter is fed by a transformer and diodes, the resistance of the transformer exceeds that of the capacitor.
transistor either increase or decrease current bt capacitor stores the energy
resistance refers to the resistance of flow of electric current wile a capacitor is an electric device that stores energy.
In a capacitor ckt, current will be lead ahead from voltage by an angle 90 degree. Because for a capacitor the relationship between voltage and current is given as v=(jx)i , where v= voltage i= current jx=capacitive reactance
Charge buildup between the plates of a capacitor stops when the current flow through the capacitor goes to zero.
A capacitor can release its stored energy at any rate. The rate is determined by ohm's law. It states that the current in amperes equals the electromotive force (or voltage difference of the capacitor's poles) divided by the resistance between the poles. I=E/R Current=volts/resistance
it will improve the power factor... The angle between voltage and current will decrease depends on capacitor value.
the purpose of the capacitor is to create a phase difference between main winding current and axillary winding. this would produce a rotating constant magnetic field which is required to produce the torque.
A thesis is the objective of your paper, it shows your perspective and is your argument for the paper. A topic sentence on the other hand, introduces what the current paragraph is about.
A: A TRANSISTOR gain is determined by current flow on the collector by adding a resistor to the emitter this current flow is reduced by adding or bypassing this resistor with a capacitor the net effect is that this emitter resistor will be reduced in value as frequency increases therefore change gain as a function of frequency input
Actually, neither d.c. nor a.c. current passes through a capacitor. A.C. current 'appears' to flow through a capacitor but, in reality, it is only flowing through the connecting circuit while what is known as a 'displacement current' (actually, a distortion of the atoms' shells rather than a conduction current) occurs within the dielectric separating the capacitor's plates. D.C. current is 'blocked' by a capacitor because, when the capacitor is fully charged, the potential difference appearing across its plates is equal and opposite that of the supply. With no net potential difference in the circuit, no current can flow.
1) in inductor there is generation of magnetic field due to flow of current . so there is phase difference in voltage and current . 2)in capacitor there is storage of charges. there is phase diff. 3)But in case of resistor there is no such things are happend . it is only a power dissipating element.therefor there is no phase difference between current and voltage.
Yes. A capacitor stores charge from any source, including AC.The difference between DC and AC, however, is that the capacitor will be constantly changing in charge, in step with the AC. Due to the nature of the capacitor, the current through the capacitor will lead the voltage by some amount, depending on capacitance and resistance. {In the ideal case of a perfect capacitor, conductors, and AC power source, the current will lead the voltage by 90 degrees phase angle.}This is called capacitive reactance.Another way for a capacitor to store charge from an AC source, of course, is to place a rectifier diode in front of the capacitor. This, then, becomes an AC to DC converter.