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Why does a capacitor keep its charge after the supply is disconnected?
Wiki User
∙ 12y ago
Yes, it can. Then you can use the charge to power something else. :)
Wiki User
∙ 12y ago
Wiki User
∙ 12y agoThe capacitor keeps its charge after the supply is disconnected because of the presence of an electric field between the two plates.
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What is a timing capacitor?
a capacitor that keeps time Capacitors do not keep time they do however charge at a specific rate of 63% of the applied voltage from a source that can be used to relate to timing since the source voltage can be calculated after a time lapse
Can a capacitor hold open an ac relay?
No, because as soon as a load is connected across a capacitor it will discharge. You need a continuous voltage supply across the coil of a relay to keep it energized. Yes. A large capacitor, 10000 mfd, can hold open a small relay for a few seconds, plus or minus, depending on your varibles.
What the purpose of capacitor?
Phase difference.
What is the use of decoupling capacitor?
The purpose of a decoupling capacitor is to decouple one part of a circuit from another. Decouple means to provide isolation. It's used to keep unwanted interference from one part of a circuit from impacting another.
Why are capacitors dangerous?
A capacitor is a device used in most electronic devices to store electric charge in order to keep the system functioning. If for example a television was in used for a few hours and then shot down, if aTechnical has to perform some hardware services on the device due to some malfunctions, He needs to handle the capacitor with care or have it discharged before touching it with his bare hands, otherwise he stands the risk of electric shock and consequently death.
Application of capacitor?
A capacitor in its simplest form is merely two electrically conductive plates separated by an insulator from each other. As such the capacitor will block any DC voltage from passing through it, up to the electrical dielectric strength of the insulator. The capacitor will accept a DC charge and an electrical field will exist between the plates of the capacitor. The capacitor will retain this charge until it either leaks away via the high electrical resistance of the insulator, or is intentionally discharged. When an AC or varying voltage is applied to a capacitor, a varying electrical field is set up between the plates of the capacitor. This will thus pass through the capacitor, and can be seen on the opposite plate. Thus, a capacitor will pass an AC voltage. Now,as to the question, " application of Capacitor". One of the oldest and most useful of capacitor applications is filtering or smoothing the output of an AC to DC power supply. In this supply, an AC voltage is rectified by a diode into a varying DC voltage. A capacitor is placed across the output, and serves to supply voltage or "fill in" the output whenever the output voltage is less than the capacitor. The capacitor subsequently recharges on the next cycle and repeats the process. Thus, the output voltage of the power supply is smoothed out.
What is timing capacitor?
a capacitor that keeps time Capacitors do not keep time they do however charge at a specific rate of 63% of the applied voltage from a source that can be used to relate to timing since the source voltage can be calculated after a time lapse
What is a timing capacitor?
a capacitor that keeps time Capacitors do not keep time they do however charge at a specific rate of 63% of the applied voltage from a source that can be used to relate to timing since the source voltage can be calculated after a time lapse
What is the use of a capacitor for the correction of ripple factor?
You get ripple in a power supply that is converting AC to DC because in a full-wave bridge the waveform, unfiltered, looks like a sine wave where the negative part of the cycle is flipped to positive. The Capacitor stores charge so its use helps keep the voltage from dropping so quickly to zero. The decay of the charge on the capacitor depends on the resistive load. If you could hold the highest voltage long enough before the next cycle voltage increased you would have no ripple. Various capacitor circuits, with other components, are used to reduce ripple to an acceptable range for an application.
Can a capacitor hold open an ac relay?
No, because as soon as a load is connected across a capacitor it will discharge. You need a continuous voltage supply across the coil of a relay to keep it energized. Yes. A large capacitor, 10000 mfd, can hold open a small relay for a few seconds, plus or minus, depending on your varibles.
What the purpose of capacitor?
Phase difference.
What are the steps behind installing a car audio capacitor?
First, the capacitor must be charged. Use a voltmeter, and when it reaches 12 volts, the capacitor is charged. The capacitor should then be installed near the car audio amplifier. Keep the negative wire attached to the battery. Then, a ground wire from the negative post on the capacitor to the car's chassis on the chassis's bare metal ground point. Next, the power wire needs to be disconnected from the amplifier's power input. Connect the wire to the positive post on the capacitor. A new power wire needs to be connected from the capacitor's positive post to the amplifier's power input. Install a 16 gauge wire from the capacitor's remote turn-on post to the amplifier's remote input. Then disconnect the negative wire from the battery.
Do capacitors store electrical energy?
Capacitors act like tiny storage batteries made of two plates separated by a thin insulator or air. When one plate is charged negative and the other positive, they build up a charge that remains when the current is removed. When its power is required, the circuit is switched to conduct current between the two plates, and the capacitor releases its charge.AnswerCapacitors don't really store charge at all. They allow negative charge to be transferred from one plate to the other, thus establishing an electric field between their plates. But there is no net increase in charge -the amount of charge on the capacitor's plates, after 'charging', is exactly the same as there was before 'charging' -it's just moved around! What capacitors 'store' is energy, not charge.
What happens if an electrical current keeps stocking up in one spot for an indefinite amount of time I e if a generator was turned on creating electricity but the electricity has nowhere to go?
A current is the flow of electrical charge and can't be "stocked up." Electrical charge itself can be "stocked up" in the form of a capacitor. If you keep increasing the charge held in a capacitor, it will eventually discharge through the air creating bolts of electricity. This is roughly how lightning works.
Does Wearable Tech Sport Jacket only supply solar power to battery or it can keep the individual warm?
It is a dual purpose jacket and can not only supply clean power supply to charge phone battery but the advanced polymers from which the jackets are made will also keep you warm and protect you from elements because it is water resistant.
How the charge oscillate in LC circuit?
If a charged capacitor is connected across an inductor, charge will start to flow through the inductor, building up a magnetic field around it, and reducing the voltage on the capacitor. Eventually all the charge on the capacitor will be gone and the voltage across it will reach zero. However, the current will continue, because inductors resist changes in current, and energy to keep it flowing is extracted from the magnetic field, which will begin to decline. The current will begin to charge the capacitor with a voltage of opposite polarity to its original charge. When the magnetic field is completely dissipated the current will stop and the charge will again be stored in the capacitor, with the opposite polarity as before. Then the cycle will begin again, with the current flowing in the opposite direction through the inductor.The charge flows back and forth between the plates of the capacitor, through the inductor. The energy oscillates back and forth between the capacitor and the inductor until (if not replenished by power from an external circuit) internal resistance makes the oscillations die out. Its action, known mathematically as a harmonic oscillator, is similar to a pendulum swinging back and forth, or water sloshing back and forth in a tank. For this reason the circuit is also called a tank circuit. The oscillation frequency is determined by the capacitance and inductance values used. In typical tuned circuits in electronic equipment the oscillations are very fast, thousands to millions of times per second.
Can you change 50 v micro farad capacitor with a 63 v 100 microfarad capacitor?
Generally, yes - a 35 uF capacitor is close in value to a 30 uF capacitor - but it depends on the circuit requirements. If you are talking about a tuned filter, I would say no. If you are talking about a power supply filter, I would say yes. Just keep in mind that it takes more current to charge a larger capacitor, so you need to consider the current rating on the diode(s). Of course, if this mattered in a power supply, then I would also say that the design margins are too tight. Again, 35 versus 30 is not a big difference - again, sometimes. Also, you need to ensure that the voltage rating of the new capacitor is equal to or greater than the voltage rating of the old capacitor.I've received a message that this capacitor is a motor starting capacitor in an air conditioner. My answer is this...Then I would consider it a tuned circuit, because phase angle of the power in the start windings would matter to the proper starting of the motor. However, my root analysis holds - you need to consider the system's design requirements.If any motor engineers out there are willing to take a stab at this, please do. I have flagged the question to attempt to get a better answer.
