currenteletricity.blogspot.com
Current Electricity: Introduction
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Sunday, January 25, 2009. Welcome to the first course in the STEP series, Siemens Technical Education Program designed to understand basics of electricity more effectively. . Upon completion of Basics of Electricity you will be able to:. 8226; Explain the difference between conductors and insulators. 8226; Use Ohm’s Law to calculate current, voltage, and resistance. 8226; Calculate equivalent resistance for series, parallel, or series-parallel circuits. 8226; Calculate voltage drop across a resistor.
currenteletricity.blogspot.com
Current Electricity: Electric Charges
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Sunday, January 25, 2009. Neutral State of an Atom. Elements are often identified by the number of electrons in orbit around the nucleus of the atoms making up the element and by the number of protons in the nucleus. A hydrogen atom, for example, has only one electron and one proton. An aluminum atom (illustrated) has 13 electrons and 13 protons. An atom with an equal number of electrons and protons is said to be electrically neutral. Positive and Negative Charges. Subscribe to: Post Comments (Atom).
currenteletricity.blogspot.com
Current Electricity: Electron Theory
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Sunday, January 25, 2009. Subscribe to: Post Comments (Atom). The law of attraction. Conductors,Insulators and Semiconductors. Many applications require more than one motor. In some instances, one drive can supply two or more motors. When this happens, the current rating of the mot. Prior to PLCs, many of these control tasks were solved with contactor or relay controls. This is often referred to as hardwired control. Circuit diagrams had. Simple template. Powered by Blogger.
currenteletricity.blogspot.com
Current Electricity: Current
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Sunday, January 25, 2009. The following chart reflects special prefixes that are used when dealing with very small or large values of current:. 1 kiloampere 1 kA 1000 A. 1 milliampere 1 mA 1/1000 A. 1 microampere 1 mA 1/1,000,000 A. Direction of Current Flow. Subscribe to: Post Comments (Atom). The law of attraction. Conductors,Insulators and Semiconductors. Simple template. Powered by Blogger.
currenteletricity.blogspot.com
Current Electricity: Ohm’s Law
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Monday, January 26, 2009. George Simon Ohm and Ohm’s Law The relationship between current, voltage and resistance was studied by the 19th century German mathematician, George Simon Ohm. Ohm formulated a law which states that current varies directly with voltage and inversely with resistance. From this law the following formula is derived:. I = E / R OR CURRENT = VOLTAGE / RESISTANCE. Ohm’s Law can only give the correct answer when the correct values are used. Remember the following three rules:.
contactors.blogspot.com
Electrical Contactors: i)Power loss
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In this blog we are going to disscus various problem associated with the contactor and their solutions. Saturday, February 21, 2009. How to calculate power loss of contactors which is generally required for thermal calculations of a switchboard. The power losses of contactors can be calculated as follows:. With DC-operated contactors: Closed power consumption of magnet coil. With AC-operated contactors: Closed power consumption of magnet coil x cos phi. Subscribe to: Post Comments (Atom).
contactors.blogspot.com
Electrical Contactors: d)Transition times too low
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In this blog we are going to disscus various problem associated with the contactor and their solutions. Wednesday, February 18, 2009. D)Transition times too low. Transition times too low. At star-delta starting and pole changing or reversing of motors transitions. Between star and delta. Or low and high speed or between rotation directions it can happen that high peak currents occur. Between star and delta and between pole changing or reversing of motors. Star-delta-timer relays from Siemens incorporate.
contactors.blogspot.com
Electrical Contactors: 6)Do & Don’ts
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In this blog we are going to disscus various problem associated with the contactor and their solutions. Thursday, February 19, 2009. 6)Do and Don’ts. 5 Do and Don’ts. A) Don’t replace slightly pitted contacts; contacts should be replaced only when 40% of silver tips is remaining. B) Don’t file the contacts, don’t use emery paper on contacts it will reduce the life of contacts drastically. C) Don’t apply grease on contacts. D) Easily separable contacts can be reused according to IEC947. Prior to PLCs, man...
