Figure 1 and Figure 2 are the basic structure and the schematic symbol of the Capacitor respectively. When a Capacitor is connected to a circuit with Direct Current DC source, two processes, which are called "charging" and "discharging" the Capacitor, will happen in specific conditions.
Both Plates get the equal and opposite charges and an increasing Potential Difference, v c , is created while the Capacitor is charging. The Voltage v c on a Capacitor cannot change abruptly. Remember that the safe discharge of the capacitor must be carried out by means of suitable resistance. Using an underrated resistor may lead to its damage. Therefore, when selecting a resistor, take into account the power emitted by the resistor, which is equal to the quotient of the square root of its voltage and resistance.
Standard resistors can transmit power of up to 0. The use of such a resistor with a larger capacitor with a large charge and voltage will result in burning it out. Therefore, in the case of small components, it is worth using a resistor with a power of 5 W and a resistance of e. Larger capacitors for electrical power applications should be equipped with discharge resistors, which after disconnecting the power supply discharge this element within a few minutes.
Safe discharge of a three-phase power capacitor should be carried out using a 4 mm 2 YDY cable and consist in short-circuiting the individual phases of the element with a PE wire. Modern technology and innovative solutions — in response to your needs.
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French Guyana. French Polynesia. Create a free Team What is Teams? Learn more. How do capacitors discharge? Ask Question. Asked 6 years, 8 months ago. Active 1 year, 6 months ago. Viewed 14k times.
Thanks a lot! Improve this question. Gonate Gonate 1 1 gold badge 1 1 silver badge 9 9 bronze badges. Add a comment. Active Oldest Votes. Improve this answer. Not sure about that. I used to have a big oil filled capacitor back in the s that I had in my power supply for a linear amplifier I built ham radio.
I could charge up this capacitor and then disconnect the capacitor and put a huge screw driver across the terminals. Not only does this cause a spark but on several occasions it just melted the tip of the screw driver. This capacitor had enough charge that I could dead short the capacitor and then do it again without intervening charge up and get more sparks.
A lot of electronics rely on the fact that the buildup of charge on a capacitor goes unsatiated. I don't mean that the capacitor itself cannot cause sparks, I mean that a spark inside the capacitor i.
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