Electrical
|
Variety of Product |
Modern Jeans |
|
Color |
Red |
|
Shape |
M |
|
Length |
30cm |
|
Weight |
0 |
|
Maturity |
None |
|
Remark |
fsfgsfbgbn |
Electric heater, device for heating rooms that converts electric current to heat by means of resistors that emit radiant energy. Resistors may be composed of metal-alloy wire, nonmetallic carbon compounds, or printed circuits. Heating elements may have exposed resistor coils mounted on insulators, metallic resistors embedded in refractory insulation and encased in protective metal, or a printed circuit encased in glass. Fins may be used to increase the area that dissipates the heat.
Electric heaters also are used for domestic central heating and for materials processing in industry (see heat pump; electric furnace).
In an electron tube, an electric heating element shaped in the form of a wire or ribbon is used to supply heat to a cathode; the element provides heat when a current is passed through it.
Home appliance, any of numerous and varied electric, electromechanical, or gas-powered devices introduced mainly in the 20th century to save labour and time in the household. Collectively, their effect on industrial society has been to eliminate the drudgery and drastically reduce the time long associated with housekeeping and homemaking. Home appliances have had little or no effect outside the world’s urban communities, but within these communities they have had a profound, even revolutionary, impact in social and economic terms. These devices have, for example, facilitated the establishment of single-person households; in two-parent families, they have enabled both parents to enter the labour market and have otherwise freed large amounts of time and energy that homemakers formerly devoted to preparing food and to laundering, house cleaning, and general housework. Hence, a further result has been the greatly diminished employment of persons engaged in domestic service. The trend toward using automatic and powered household implements to ease basic housekeeping chores, once established, soon extended into such additional fields as personal hygiene and grooming.
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