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Edison Screw
EDISON SCREW (ES) is a standard socket for light bulbs in the United States. It was developed by Thomas Edison
Thomas Edison
and was licensed in 1909 under the Mazda trademark. Normally, the bulbs have right-hand threaded metal bases (caps) which screw into matching threaded sockets (lamp holders). For bulbs powered by AC current , the thread is connected to neutral and the contact on the bottom tip of the base is connected to hot. In North America
North America
and continental Europe , Edison screws displaced other socket types for general lighting. In the early days of electrification, Edison screws were the only standard connector, and appliances other than bulbs were connected to AC power via light sockets. Today Edison screw
Edison screw
sockets comply with international standards. CONTENTS * 1 History * 2 Types * 3 Other uses * 4 Fittings * 5 See also * 6 Notes * 7 References HISTORYEarly U.S
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China
CHINA, officially the PEOPLE\'S REPUBLIC OF CHINA (PRC), is a unitary sovereign state in East Asia and the world\'s most populous country , with a population of over 1.381 billion . Covering approximately 9.6 million square kilometres (3.7 million square miles), it is the world's second-largest state by land area and third- or fourth-largest by total area . Governed by the Communist Party of China
China
, it exercises jurisdiction over 22 provinces , five autonomous regions , four direct-controlled municipalities (Beijing, Tianjin
Tianjin
, Shanghai
Shanghai
, and Chongqing
Chongqing
) and the Special Administrative Regions
Special Administrative Regions
Hong Kong and Macau
Macau
, also claiming sovereignty over Taiwan
Taiwan

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Domestic Power
MAINS ELECTRICITY is the general-purpose alternating-current (AC) electric power supply. Mains electricity is the form of electrical power that is delivered to homes and businesses, and it is the form of electrical power that consumers use when they plug kitchen appliances, televisions and electric lamps into wall sockets. 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 Africa, most of Asia, much of South America
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 with, or may even be destroyed by another
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North America
NORTH AMERICA is a continent entirely within the Northern Hemisphere and almost all within the Western Hemisphere . It can also be considered a northern subcontinent of the Americas . It is bordered to the north by the Arctic Ocean
Arctic Ocean
, to the east by the Atlantic Ocean , to the west and south by the Pacific Ocean
Pacific Ocean
, and to the southeast by South America
South America
and the Caribbean Sea
Caribbean Sea
. North America
North America
covers an area of about 24,709,000 square kilometers (9,540,000 square miles), about 16.5% of the earth's land area and about 4.8% of its total surface
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Japan
Coordinates : 35°N 136°E / 35°N 136°E / 35; 136 Japan 日本国 Nippon-koku Nihon-koku Flag Imperial Seal ANTHEM: * " Kimigayo " * 君が代 "His Imperial Majesty's Reign" GOVERNMENT SEAL OF JAPAN * * Go-Shichi no Kiri (五七桐) Area controlled by Japan
Japan
shown in green Capital and largest city
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Taiwan
TAIWAN (/ˌtaɪˈwɑːn/ ( listen )), officially the REPUBLIC OF CHINA (ROC), is a democratic state in East Asia . Its neighbours include China
China
(officially the People's Republic of China, PRC) to the west, Japan
Japan
to the northeast, and the Philippines
Philippines
to the south. Taiwan is the most populous state that is not a member of the United Nations , and also possesses the largest economy of any state outside of the UN. The island of Taiwan
Taiwan
, formerly known as Formosa, was inhabited by Taiwanese aborigines
Taiwanese aborigines
before the 17th century, when Dutch and Spanish colonies opened the island to mass Han immigration. After a brief rule by the Kingdom of Tungning
Kingdom of Tungning
, the island was annexed by the Qing dynasty , the last dynasty of China
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Alternating Current
ALTERNATING CURRENT (AC) is an electric current which periodically reverses direction, in contrast to direct current (DC) which flows only in one direction. Alternating current
Alternating current
is the form in which electric power is delivered to businesses and residences, and it is the form of electrical energy that consumers typically use when they plug kitchen appliances , televisions and electric lamps into a wall socket . A common source of DC power is a battery cell in a flashlight . The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage . The usual waveform of alternating current in most electric power circuits is a sine wave . In certain applications, different waveforms are used, such as triangular or square waves
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Low Voltage
In electrical engineering LOW VOLTAGE is a relative term, the definition varying by context. Different definitions are used in electric power transmission and distribution, and electrical safety codes define "low voltage" circuits that are exempt from the protection required at higher voltages. These definitions vary by country and specific codes or regulations. CONTENTS * 1 IEC Definition * 2 UK * 3 USA * 4 See also * 5 References IEC DEFINITION IEC VOLTAGE RANGE AC (VRMS ) DC (V ) DEFINING RISK High voltage
High voltage
(supply system) > 1000 > 1500 Electrical arcing Low voltage (supply system) 50–1000 120–1500 Electrical shock Extra-low voltage (supply system) < 50 < 120 Low riskThe International Electrotechnical Commission
International Electrotechnical Commission
(IEC) defines supply system low voltage as voltage in the range 50–1000 V AC or 120–1500 V DC
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Microwave Oven
A MICROWAVE OVEN (commonly referred to as a MICROWAVE) is a kitchen appliance that heats and cooks food by exposing it to electromagnetic radiation in the microwave frequency range. This induces polar molecules in the food to rotate and produce thermal energy in a process known as dielectric heating . Microwave ovens heat foods quickly and efficiently because excitation is fairly uniform in the outer 25–38 mm (1–1.5 inches) of a homogeneous , high water content food item; food is more evenly heated throughout than generally occurs in other cooking techniques. Percy Spencer is generally credited with inventing the modern microwave oven after World War II
World War II
from radar technology developed during the war
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Emergency Exit
An EMERGENCY EXIT in a structure is a special exit for emergencies such as a fire: the combined use of regular and special exits allows for faster evacuation, while it also provides an alternative if the route to the regular exit is blocked by fire, etc. The qualifications for an emergency exit are as follows: it must be in a location that is easily accessible, the exit must have an area or location that it can bring you too in the event of any emergency situation, it must be controlled by the inside of the building, it must be well managed and regularly up kept, and it must be in a permanent location. It is usually in a strategically located (e.g. in a stairwell, hallway, or other likely place) outward opening door with a crash bar on it and with exit signs leading to it. The name is a reference to when they were frequently used, however a fire exit can also be a main doorway must be able to be unlocked from the inside of the room
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Ampere
The AMPERE (symbol: A), often shortened to "amp", is the base unit of electric current in the International System of Units (SI). It is named after André-Marie Ampère
André-Marie Ampère
(1775–1836), French mathematician and physicist, considered the father of electrodynamics . SI defines the ampere in terms of other base units by measuring the electromagnetic force between electrical conductors carrying electric current. The earlier CGS measurement system had two different definitions of current, one essentially the same as the SI's and the other using electric charge as the base unit, with the unit of charge defined by measuring the force between two charged metal plates. The ampere was then defined as one coulomb of charge per second. In SI, the unit of charge, the coulomb, is defined as the charge carried by one ampere during one second
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Table Lamp
A LIGHT FIXTURE (US English), LIGHT FITTING (UK English), or LUMINAIRE is an electrical device used to create artificial light by use of an electric lamp . All light fixtures have a fixture body and a light socket to hold the lamp and allow for its replacement. Fixtures may also have a switch to control the light, either attached to the lamp body or attached to the power cable. Permanent light fixtures, such as dining room chandeliers, may use a wall switch to turn them on and off; as such, these fixtures may have no switch on the fixture itself. Fixtures require an electrical connection to a power source, typically AC mains
AC mains
power, but may also have battery power for camping or emergency lights. Permanent lighting fixtures may be directly wired. Moveable lamps have a plug and cord so that they can be plugged into a wall socket
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Ceiling Fan
A CEILING FAN is a mechanical fan , usually electrically powered , suspended from the ceiling of a room, that uses hub-mounted rotating paddles to circulate air. Casablanca Fan Co. "Delta" ceiling fan from the early 1980s. Most of the ceiling fans rotate much more slowly than most electric desk fans. They cool people effectively by introducing slow movement into the otherwise still, hot air of a room. Fans never actually cool air, unlike air-conditioning equipment, but use significantly less power (cooling air is thermodynamically expensive). Conversely, a ceiling fan can also be used to reduce the stratification of warm air in a room by forcing it down to affect both occupants' sensations and thermostat readings, thereby improving climate control energy efficiency
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Pea
The PEA is most commonly the small spherical seed or the seed-pod of the pod fruit PISUM SATIVUM. Each pod contains several peas. Pea
Pea
pods are botanically fruit , since they contain seeds and developed from the ovary of a (pea) flower. The name is also used to describe other edible seeds from the Fabaceae
Fabaceae
such as the pigeon pea (Cajanus cajan), the cowpea (Vigna unguiculata), and the seeds from several species of Lathyrus
Lathyrus
. P. sativum is an annual plant , with a life cycle of one year. It is a cool-season crop grown in many parts of the world; planting can take place from winter to early summer depending on location. The average pea weighs between 0.1 and 0.36 grams
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Model Train
RAILWAY MODELLING (UK, Australia
Australia
and Ireland) or MODEL RAILROADING (US and Canada) is a hobby in which rail transport systems are modelled at a reduced scale . The scale models include locomotives , rolling stock , streetcars , tracks , signalling and landscapes including: countryside, roads, buildings, vehicles, model figures , lights, and features such as rivers , hills , and canyons . The earliest MODEL RAILWAYs were the 'carpet railways ' in the 1840s. Electric trains appeared around the start of the 20th century, but these were crude likenesses. Model trains today are more realistic. Today modellers create model railway layouts , often recreating real locations and periods throughout history
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