Search results
Results from the WOW.Com Content Network
An example of a copper alloy conductor is cadmium copper wire, which is used for railroad electrification in North America. [5] In Britain the BPO (later Post Office Telecommunications ) used cadmium copper aerial lines with 1% cadmium for extra strength; for local lines 40 lb/mile (1.3 mm dia) and for toll lines 70 lb/mile (1.7 mm dia).
North American domestic analog (Ferraris disk) electricity meter. Electricity meter with transparent plastic case (Israel) An electricity meter, electric meter, electrical meter, energy meter, or kilowatt-hour meter is a device that measures the amount of electric energy consumed by a residence, a business, or an electrically powered device over a time interval.
Solid electrolyte tantalum capacitor was invented by Bell Laboratories. 1950: French physicist Alfred Kastler invented the MASER. 1951: First nuclear power plant in the US 1952: Japanese engineer Jun-ichi Nishizawa invented the avalanche photodiode [20] 1953: First fully transistorized computer in the U.S. 1958
The positive wire is made of hard iron, while the negative wire consists of softer copper-nickel. [11] Due to its iron content, the J-type is slightly heavier and the positive wire is magnetic. [12] It is highly vulnerable to corrosion in reducing atmospheres, which can lead to significant degradation of the thermocouple's performance. [13]
[12] [11] [14] [15] AWG 8 to AWG 10 soft-drawn copper wire is typically used, buried 4–10 inches deep. [14] For AM broadcast band antennas this requires a circular land area extending from the mast 47–136 meters (154–446 ft). This is usually planted with grass, which is kept mowed short, as tall grass can increase power loss in certain ...
An early D'Arsonval galvanometer showing magnet and rotating coil. A galvanometer is an electromechanical measuring instrument for electric current.Early galvanometers were uncalibrated, but improved versions, called ammeters, were calibrated and could measure the flow of current more precisely.
These were the first alternating-current watt-hour meters, known by the name of Bláthy-meters. [16] The AC kilowatt hour meters used at present operate on the same principle as Bláthy's original invention. [6] [17] [18] [19] In 1886 Blathy undertook a journey to America, where he also visited the Edison Works.
A small factor contributes to the correction of the total heat of combustion is the fuse wire. Nickel fuse wire is often used and has heat of combustion: 981.2 cal/g. In order to calibrate the bomb, a small amount (~ 1 g) of benzoic acid, or p-methyl benzoic acid is weighed. A length of nickel fuse wire (~10 cm) is weighed both before and after ...