A vacuum tube that contains two elements is called a diode and contains a cathode and plate. A vacuum tube that contains three elements is called a triode and contains a cathode, grid, and plate. A vacuum tube that contains four elements is called a tetrode and contains a cathode, control grid, screen grid, and plate.
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In the course of my travels for many years now, it has become apparent that most electricians don’t understand Ohm’s law, watts and torque. It’s very simple. Electrical wires and connections need to operate at a temperate of no more than 60° or 75° Celsius. The only way to measure the temperature is to measure [...]
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Voltage, current, resistance, and power are fundamental electrical terms. We have taken a look at the definition of each, and have discussed calculation methods useful in solving for each. In the real world, how do we go about measuring these units? Test instruments or meters are the most common pieces of electrical equipment that measure these values.
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In the last issue we discussed the NEC requirements up through 110.14, Electrical Connections, so we will start with 110.15, the requirement for identifying the high leg. Now you’re probably asking, what is a high leg? To answer that, we have to review some of the basics related to voltages and transformer windings and connections.
(2 votes, average: 5.00 out of 5)Electrical calculations generally fall within two categories: dc circuit analysis and ac circuit analysis. In a typical engineering curriculum dc circuit analysis is introduced first with resistive networks. Once all the network theorems are discussed and evaluated, ac circuit analysis is introduced.
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A little bit of history is in order before we get into AC and DC circuit theory. In the latter part of the 19th century there were three principal players in the electrical generation and transmission industry. Thomas Edison, known as the “Wizard of Menlo Park” and most famous for his invention of the electric light bulb, was the main proponent of direct current (DC) transmission. George Westinghouse and Nikola Tesla were the main proponents of alternating current (AC) transmission. History documents this formative period in the development of electrical generation and transmission as the “War of Currents.”
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The atom is the smallest individual structure that makes up any chemical element while retaining properties of the element. The atom has a nucleus that contains protons and neutrons. Electrons orbit the nucleus at various distances and with varying amounts of energy.
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IAEI, as the keystone of the electrical industry, is a membership driven, non-profit association promoting electrical safety throughout the industry by providing premier education, certification of inspectors, advocacy, partnerships and expert leadership in Electrical Codes and Standards development.
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