How Capacitors Work HowStuffWorks
페이지 정보
본문
"PCB" in electronics usually means printed circuit board, but the above usage is an exception. Capacitors containing PCB were labelled as containing "Askarel" and several other trade names. Above and beyond usual hazards associated with working with high voltage, high energy circuits, there are a number of dangers that are specific to high voltage capacitors. High voltage capacitors may catastrophically fail when subjected to voltages or currents beyond their rating, or as they reach their normal end of life. Dielectric or metal interconnection failures may create arcing within oil filled units that vaporizes dielectric fluid, resulting in case bulging, rupture, or even an explosion that disperses flammable oil, starts fires, and damages nearby equipment.
High ESR is the first sign of a capacitor failure. High ESR will cause complete circuit failure, over heating of capacitor, loading of the circuit, overstressing of other circuit components and other undesirable effects. Because measuring an electrolytic capacitor with an analog or digital capacitance meter can MISLEAD a technician into believing that a defective capacitor is good. This can waste your precious time and you are unable to repair the equipment. Which means you can’t charge your customer!If you don’t test for ESR on the capacitor, you will always miss the bad capacitor. Normally, these bad capacitors have high ESR reading which your normal multimeter or digital capacitance meter can’t measure.
Voltage and current are brothers, current flows from a place where the voltage level is high to a place where the voltage level is low, a current must be generated because of the presence of a voltage, but the presence of a voltage does not necessarily generate a current if there is only a voltage and no current, it can be proved that there is an interruption in the circuit e. g. , there is a switch in the circuit. If there is only voltage but no current, it is evidence of a circuit break e. g.
Benjamin Franklin worked with the Leyden jar in his experiments with electricity and soon found that a flat piece of glass worked as well as the jar model, prompting him to develop the flat capacitor, or Franklin square. Years later, English chemist Michael Faraday would pioneer the first practical applications for the capacitor in trying to store unused electrons from his experiments. This led to the first usable capacitor, made from large oil barrels. Faraday's progress with capacitors is what eventually enabled us to deliver electric power over great distances. As a result of Faraday's achievements in the field of electricity, the unit of measurement for capacitors, or capacitance, became known as the farad.
The invention of the capacitor varies somewhat depending on who you ask. There are records that indicate a German scientist named Ewald Georg von Kleist invented the capacitor in November 1745. Several months later Pieter van Musschenbroek, a Dutch professor at the University of Leyden, came up with a very similar device in the form of the Leyden jar, which is typically credited as the first capacitor. Since Kleist didn't have detailed records and notes, nor the notoriety of his Dutch counterpart, he's often overlooked as a contributor to the capacitor's evolution. However, over the years, both have been given equal credit as it was established that their research was independent of each other and merely a scientific coincidence.
The enter voltage source may have an extensive variety of voltage qualities. Air conditioning wellsprings of 50Hz to 400Hz at under 24Vac to 480Vac are regular. DC sources going from 5Vdc to 300Vdc can likewise be found. It is basic for the client to comprehend the data voltage necessity as this will affect general framework utilize and plan. Administrative offices, for example, Underwriters Laboratory, Canadian Standards Association, IEC and others are profoundly included with any circuits joined with the force framework. Notwithstanding is controlling the fundamental inverter circuits of the force supply; the data voltage source is additionally used to power helper control circuits and other auxiliary force necessities. The data channel stage gives molding of the information voltage source. This molding is for the most part as amendment and sifting in air conditioning sources, and extra separating in dc sources. Over-burden assurance, EMI, EMC and observing circuits can likewise be found. The yield of the data channel is ordinarily a dc voltage source.
The difference between a capacitor and a battery is that a capacitor can dump its entire charge in a tiny fraction of a second, where a battery would take minutes to completely discharge. That's why the electronic flash on a camera uses a capacitor — the battery charges up the flash's capacitor over several seconds, and then the capacitor dumps the full charge into the flash tube almost instantly. This can make a large, charged capacitor extremely dangerous — flash units and TVs have warnings about opening them up for this reason. They contain big capacitors that can potentially kill you with the charge they contain.
High ESR is the first sign of a capacitor failure. High ESR will cause complete circuit failure, over heating of capacitor, loading of the circuit, overstressing of other circuit components and other undesirable effects. Because measuring an electrolytic capacitor with an analog or digital capacitance meter can MISLEAD a technician into believing that a defective capacitor is good. This can waste your precious time and you are unable to repair the equipment. Which means you can’t charge your customer!If you don’t test for ESR on the capacitor, you will always miss the bad capacitor. Normally, these bad capacitors have high ESR reading which your normal multimeter or digital capacitance meter can’t measure.
Voltage and current are brothers, current flows from a place where the voltage level is high to a place where the voltage level is low, a current must be generated because of the presence of a voltage, but the presence of a voltage does not necessarily generate a current if there is only a voltage and no current, it can be proved that there is an interruption in the circuit e. g. , there is a switch in the circuit. If there is only voltage but no current, it is evidence of a circuit break e. g.
Benjamin Franklin worked with the Leyden jar in his experiments with electricity and soon found that a flat piece of glass worked as well as the jar model, prompting him to develop the flat capacitor, or Franklin square. Years later, English chemist Michael Faraday would pioneer the first practical applications for the capacitor in trying to store unused electrons from his experiments. This led to the first usable capacitor, made from large oil barrels. Faraday's progress with capacitors is what eventually enabled us to deliver electric power over great distances. As a result of Faraday's achievements in the field of electricity, the unit of measurement for capacitors, or capacitance, became known as the farad.
The invention of the capacitor varies somewhat depending on who you ask. There are records that indicate a German scientist named Ewald Georg von Kleist invented the capacitor in November 1745. Several months later Pieter van Musschenbroek, a Dutch professor at the University of Leyden, came up with a very similar device in the form of the Leyden jar, which is typically credited as the first capacitor. Since Kleist didn't have detailed records and notes, nor the notoriety of his Dutch counterpart, he's often overlooked as a contributor to the capacitor's evolution. However, over the years, both have been given equal credit as it was established that their research was independent of each other and merely a scientific coincidence.
The enter voltage source may have an extensive variety of voltage qualities. Air conditioning wellsprings of 50Hz to 400Hz at under 24Vac to 480Vac are regular. DC sources going from 5Vdc to 300Vdc can likewise be found. It is basic for the client to comprehend the data voltage necessity as this will affect general framework utilize and plan. Administrative offices, for example, Underwriters Laboratory, Canadian Standards Association, IEC and others are profoundly included with any circuits joined with the force framework. Notwithstanding is controlling the fundamental inverter circuits of the force supply; the data voltage source is additionally used to power helper control circuits and other auxiliary force necessities. The data channel stage gives molding of the information voltage source. This molding is for the most part as amendment and sifting in air conditioning sources, and extra separating in dc sources. Over-burden assurance, EMI, EMC and observing circuits can likewise be found. The yield of the data channel is ordinarily a dc voltage source.
The difference between a capacitor and a battery is that a capacitor can dump its entire charge in a tiny fraction of a second, where a battery would take minutes to completely discharge. That's why the electronic flash on a camera uses a capacitor — the battery charges up the flash's capacitor over several seconds, and then the capacitor dumps the full charge into the flash tube almost instantly. This can make a large, charged capacitor extremely dangerous — flash units and TVs have warnings about opening them up for this reason. They contain big capacitors that can potentially kill you with the charge they contain.
- 이전글Are Marriages Made in Heaven or Dating Sites 24.07.04
- 다음글7 Simple Changes That Will Make The Biggest Difference In Your Shopping Online Uk 24.07.04
댓글목록
등록된 댓글이 없습니다.
