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Fire Alarm System - Shoreline Fire Department
Fire Alarm System - Shoreline Fire Department

V - Mr. B. Gillis`s Weblog
V - Mr. B. Gillis`s Weblog

Design and Implementation of a GSM based Electronic Appliances
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... direction but not in the other. Since relay coils have a large amount of inductance, they generate a very large voltage spike when released which can destroy the transistor, the microcontroller and other electronic elements. Hence, to ii) The relay switch board prevent these damages a protection dio ...
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TEACHING AND DEMONSTRATION OF OPTIMIZED DESIGN

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< 1 ... 1674 1675 1676 1677 1678 1679 1680 1681 1682 ... 1974 >

Mains electricity



Mains electricity is the general-purpose alternating-current (AC) electric power supply. In the US, electric power is referred to by several names including household power, household electricity, house current, powerline, domestic power, wall power, line power, AC power, city power, street power, and grid power.The two principal properties of the electric power supply, voltage and frequency, differ between regions. A voltage of (nominally) 230 V and a frequency of 50 Hz is used in Europe, most of Asia, most of South America and Australia. In North America, the most common combination is 120 V and a frequency of 60 Hz. Other voltages exist, and some countries may have, for example, 230 V but 60 Hz. This is a concern to travelers, since portable appliances designed for one voltage and frequency combination may not operate or may be destroyed by another.The use of different plugs and sockets in different regions provides some protection from accidental use of appliances with incompatible voltage and frequency requirements.
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