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:.
acdcdrives.blogspot.com
AC DC Drives: Constant Torque Applications
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Sunday, January 25, 2009. Conveyors are made up of belts to support the load, various pulleys to support the belt, maintain tension, and change belt direction, and idlers to support the belt and load. If, for example, the maximum desired speed of a conveyor is. Effective tension (Te) is determined by several forces:. 8226; Gravitational weight of the load. 8226; Length and weight of belt. 8226; Friction of material on the conveyor. 8226; Friction of all drive components and accessories. 2000 pounds and t...
acdcdrives.blogspot.com
AC DC Drives: Variable Torque Applications
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Sunday, January 25, 2009. A variable torque load implies that torque and horsepower increase with an increase in speed. Overloads, as a rule of thumb, are not possible at lower speeds. Peak torques are typically limited to rated torque. Fans and pumps are examples of variable torque. A pump used on a chilled water system is shown below. Liquid horsepower is the hydraulic power transferred to the pumped liquid. The following formula can be used to calculate liquid energy. If the pumps speed were increased...
acdcdrives.blogspot.com
AC DC Drives: Constant Horsepower Applications
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Sunday, January 25, 2009. Constant horsepower applications require a constant force as radius changes. A lathe, for example, starts out with a certain diameter object. As the object is cut and shaped the diameter is reduced. The cutting force must remain constant. Another example of a constant horsepower application is a winder where radius increases as material is added to a roll and decreases as material is removed. Relationship of Speed, Torque, and Horsepower. Horsepower is equal to torque times speed.
acdcdrives.blogspot.com
AC DC Drives: Introduction
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Wednesday, January 14, 2009. Welcome to course in the STEP 2000 series, Siemens. Technical Education Program, designed to understand basic of AC drives more effectively. This course covers Basics of AC Drives. Upon completion of Basics of AC Drives you should be able to:. 8226; Explain the concept of force, inertia, speed, and torque. 8226; Explain the difference between work and power. 8226; Describe the construction of a squirrel cage AC motor. Application to an AC Drive. View my complete profile.
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).
