This consists of understanding the operation of all the components that are used in the circuit. This could include such components as: push buttons, contactors, various types of switches, relays, sensors, motors, etc. Electrical circuits typically control or operate mechanical systems and components. You also need to understand how these mechanical aspects of the equipment operate to carry out the work. You need to be able to determine how the circuit works under normal conditions and what effect changing one of the circuit inputs has on the circuit operation. For example, what happens to the overall circuit operation when a push button is pressed; which relays energize, which lights illuminate, does the pump start or stop, etc. You also need to be able to determine what effect a faulty component may have on the circuit operation.
Tuesday, October 7, 2008
Understand how the circuit works
This consists of understanding the operation of all the components that are used in the circuit. This could include such components as: push buttons, contactors, various types of switches, relays, sensors, motors, etc. Electrical circuits typically control or operate mechanical systems and components. You also need to understand how these mechanical aspects of the equipment operate to carry out the work. You need to be able to determine how the circuit works under normal conditions and what effect changing one of the circuit inputs has on the circuit operation. For example, what happens to the overall circuit operation when a push button is pressed; which relays energize, which lights illuminate, does the pump start or stop, etc. You also need to be able to determine what effect a faulty component may have on the circuit operation.
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An electrical circuit is a network that has a closed loop, giving a return path for the current. A network is a connection of two or more components, and may not necessarily be a circuit
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It was realy good to learn how circuit works. There are many circuits present in electronic components. To know more about different electronic components visit http://www.chipchecker.com.
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From StreetZaps.com:
MYTH BUSTERS FINALLY GET BUSTED!
So Myth Busters doesn't believe that saline solutions increase conductivity? They should go back to the basic fifth grade experiment with a battery and salt water! Or what about the saline paste used for taking EEG readings in a medical office? Then again, Myth Busters have always focused on the comedic rather than realistic.
Let's consider the show some years ago that attempted to prove that urinating on a high tension line such as a third rail would not be harmful. In that winner, they employed a fluorescent light ballast to simulate the power source. In reality such a ballast uses high voltage alternating current to ignite the arc inside the tube. By contrast, a third rail supplies direct current at very high current levels to propel trains weighing on average 400 tons unloaded. High voltage is not inherently dangerous, it is the high current that creates tissue damage, more so where direct current is involved because of the electrochemical effects on the body. The difference between high voltage and high current is understandable by a 7th grade science student but apparently such facts never are allowed to interfere with a good show.
Moreover, the issues of stray current and water, especially saline, are well known. Electrical utilities with underground lines have strict rules as to the maximum time that supply cables can be de-energized and then reloaded without an insulation test. The concern is moisture infiltration when the unloaded cables cool, a concern that peaks when saline slush infiltrates electric cable ducts after snow melts. Furthermore, contact voltage incidents occur irrespective of salinity or even external conditions. While electrocutions are fortunately rare, no doubt, people have experienced minor incidents, especially in the tingle or nuisance electrical range, and simply shrugged them off or failed to understand them.
In another example, some years ago frequent track fires were noted in the railroad tunnel under Park Avenue in New York City, particularly several days after heavy snows. The culprit was saline drippings from the street above that compromised porcelain third rail insulators and allowed a ground path through the steel brackets that supported the under-running type third rail used there. Those stray voltage paths ignited subsequently the wood track ties on which grease inevitably accumualtes. The solution was the replacement of the brackets with non-conductive fiberglass mounts.
Every one of the previous examples involves some sort of saline solution that enhanced the conductivity of a particular device or line. No matter what the type of salt - the very term "salt" implies an ionic bond of a metal and non-metal, chlorine, which in water dissolves to form ions which are inherently electrically conductive by their very nature. While it may be expecting too much for the writers to read up on Basic Chemistry 101 or Intro Physics 101 - if they are claiming to represent facts then an electrical engineer or, at the very least, a grade school science teacher should be interviewed to acquaint the writers with technological and scientific reality.
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Thanks for helping me understand a little better how an electrical circuit works! Electricity has always been one of those things that I have trouble understanding.
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