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ER Week11, Other Sources, Photoresistor
ER Week11, Other Sources, Photoresistor

...  Two forms of solar energy conversion:  Solar thermal, that is, thermal systems (hot water, pool heaters) produce heat from the sun’s radiation at 40% efficiency.  Photovoltaic (photo = light; voltaic = produces voltage) systems convert light directly into electricity using semiconductor technolo ...
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< 1 ... 1681 1682 1683 1684 1685 1686 1687 1688 1689 ... 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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