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source of electricity

More than 85 percent of source of electricity ( electric power generated) in North America is produced by AC generators that are driven by steam turbines. Of this amount, more than 65 percent of the steam is produced by burning of fossil fuels, primarily coal and natural gas. The below chart illustrates the distribution of …

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electrical codes and standards

he generation, transmission, and distribution of electrical power are now deregulated, but many rules, electrical codes and standards , regulations, still apply to the manufacture of electrical equipment, the job site, and the installation of electrical systems. Many of these standards are focused on safety issues, such as the elimination or avoidance of hazards in …

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electrical wiring diagrams

The most common electrical drawings are wiring diagrams or wiring plans. In these drawings the electrical lines and symbols are superimposed on an architectural floor plan. The drawing scale must be large enough to permit symbols and line conventions to be drawn legibly. Floor plans for new homes, office buildings, and large industrial, commercial, or …

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What Are Electrical Specifications?

Electrical specifications for buildings or projects are written legal descriptions of the work to be performed by the electrical contractor, subcontractors, and electric power utilities and the responsibilities and duties of the architect/engineer, general contractor, and owner. Electrical specifications and electrical drawings are integral parts of the contract requirements for the performance of electrical work. …

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fixed and variable resistors

A Linear resistor is one whose resistance doesn’t vary with the flow of current through it. The current through it, will always be proportional to the voltage applied across it. Linear resistors are further classified as Fixed and Variable resistors. Variable resistors are those whose values can be varied manually, according to the requirement. A …

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intrinsic and extrinsic semiconductor

In order to increase the conduction capability of intrinsic semiconductor, it is better to add some impurities. This process of adding impurities is called as Doping. Now, this doped intrinsic semiconductor is called as an Extrinsic Semiconductor. A Semiconductor in its extremely pure form is said to be an intrinsic semiconductor. The properties of this …

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what is intrinsic semiconductor

A Semiconductor in its extremely pure form is said to be an intrinsic semiconductor. The properties of this pure semiconductor are as follows: The electrons and holes are solely created by thermal excitation. The number of free electrons is equal to the number of holes. The conduction capability is small at room temperature. In order …

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joints in concrete

Several types of joints may occur or be formed in concrete structures: Construction joints are formed when fresh concrete is placed against hardened concrete. Expansion joints are provided in long components to relieve compressive stresses that would otherwise result from a temperature rise. Contraction joints (control joints) are provided to permit concrete to contract during …

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