what is electric current? What is SI unit of electric current??
Answers
Answer:
Unit of electric current: ampere (A)
The ampere, symbol A, is the SI unit of electric current. It is defined by taking the fixed numerical value of the elementary charge e to be 1.602 176 634 ×10−19 when expressed in the unit C, which is equal to A s, where the second is defined in terms of ∆νCs.
Explanation:
hope it helps you my siso ❤️
coulomb, unit of electric charge in the metre-kilogram-second-ampere system, the basis of the SI system of physical units. It is abbreviated as C. The coulomb is defined as the quantity of electricity transported in one second by a current of one ampere. Named for the 18th–19th-century French physicist Charles-Augustin de Coulomb, it is approximately equivalent to 6.24 × 1018 electrons, with the charge of one electron, the elementary charge, being defined as 1.602176634 × 10−19 C.
FAST FACTS
Facts & Related Content
Related Topics: International System of Units electric charge unit
The Editors of Encyclopaedia Britannica
This article was most recently revised and updated by Erik Gregersen.
Learn More in these related Britannica articles:
Millikan oil-drop experiment
electric charge
…and SI systems is the coulomb and is defined as the amount of electric charge that flows through a cross...…
Charles-Augustin de Coulomb, detail of a bronze bust.
Charles-Augustin de Coulomb
The coulomb, a unit of electric charge, was named in his honour.…
metre
metre (m), in measurement, fundamental unit of length in the metric system and in the...…
newsletter icon
HISTORY AT YOUR FINGERTIPS
Sign up here to see what happened On This Day, every day in your inbox!
Email address
Email address
By signing up, you agree to our Privacy Notice.
week
Home
Science
Physics
Matter & Energy
week
chronology
BY The Editors of Encyclopaedia Britannica | View Edit History
week, period of seven days, a unit of time artificially devised with no astronomical basis. The week’s origin is generally associated with the ancient Jews and the biblical account of the Creation, according to which God laboured for six days and rested on the seventh. Evidence indicates, however, that the Jews may have borrowed the idea of the week from Mesopotamia, for the Sumerians and the Babylonians divided the year into weeks of seven days each, one of which they designated a day of recreation.
FAST FACTS
Related Content
Related Topics: calendar time month day unit
The Babylonians named each of the days after one of the five planetary bodies known to them (Mercury, Venus, Mars, Jupiter, and Saturn) and after the Sun and the Moon, a custom later adopted by the Romans. For centuries the Romans used a period of eight days in civil practice, but in 321 CE Emperor Constantine established the seven-day week in the Roman calendar and designated Sunday as the first day of the week. Subsequent days bore the names Moon’s-day, Mars’s-day, Mercury’s-day, Jupiter’s-day, Venus’s-day, and Saturn’s-day. Constantine, a convert to Christianity, decreed that Sunday should be a day of rest and worship.
The days assigned by the Romans to the Sun, Moon, and Saturn were retained for the corresponding days of the week in English (Sunday, Monday, and Saturday) and several related languages. The Roman names for the other days of the week were retained in Romance languages. (For example, Friday, Venus’s-day is viernes in Spanish and vendredi in French.) The other weekday names in English are derived from Anglo-Saxon words for the gods of Teutonic mythology. Tuesday comes from Tiu, or Tiw, the Anglo-Saxon name for Tyr, the Norse god of war. Tyr was one of the sons of Odin, or Woden, the supreme deity after whom Wednesday was named. Similarly, Thursday originates from Thor’s-day, named in honour of Thor, the god of thunder. Friday was derived from Frigg’s-day, Frigg, the wife of Odin, representing love and beauty, in Norse mythology.
The Editors of Encyclopaedia Britannica
This article was most recently revised and updated by Erik Gregersen.
Learn More in these related Britannica articles:
Jerusalem: Western Wall, Temple Mount
Judaism: The Sabbath
…the origin of the seven-day week, nor can they account for the origin of the Sabbath. A seven-day week...…
First complete printed title page for the Kalendarium (“Calendar”) by Regiomontanus, 1476.
calendar: Standard units and cycles
The seven-day week may owe its origin partly to the four (approximately) seven-day phases of the Moon...…
First complete printed title page for the Kalendarium (“Calendar”) by Regiomontanus, 1476.
calendar: Peru: the Inca calendar
…on the basis of six weeks of nine days suggests the further possibility of a count by triads that could...…
newsletter icon
HISTORY AT YOUR FINGERTIPS
Sign up here to see what happened On This Day, every day in your inbox!
Email address
Email address
By signing up, you agree to our Privacy Notice.
hey Santa ❤️
maine aap se kuch pucha tha