In signal processing, the energy of a continuous-time signal x(t) is defined as
the energy of a discrete-time signal x(t) is defined as
Energy in this context is not, strictly speaking, the same as the conventional notion of energy in physics and the other sciences. The two concepts are, however, closely related, and it is possible to convert from one to the other:
For example, if x(t) represents the potential (in volts) of an electrical signal propagating across a transmission line, then Z would represent the characteristic impedance (in ohms) of the transmission line. The units of measure for the signal energy would appear as volt2·seconds, which is not dimensionally correct for energy in the sense of the physical sciences. After dividing by Z, however, the dimensions of E would become volt2·seconds per ohm, which is equivalent to joules, the SI unit for energy as defined in the physical sciences.
On September 18, 2001, Collective Soul released their greatest hits compilation Seven Year Itch: Greatest Hits, 1994-2001 (stylized as 7even Year Itch). The compilation includes songs recorded from 1994 to 2001 and included two new tracks; "Next Homecoming" and "Energy". Seven Year Itch received decent reviews and was relatively successful It sold 225,000 copies in the first year after its release and reached number fifty on the Billboard 200; in Canada, it reached number nine on its albums chart and went platinum. All the songs in Seven Year Itch had charted in the US on the Billboard Hot 100, Mainstream Rock Tracks, or the Modern Rock Tracks chart, except for "Energy", which debuted in this compilation.
The compilation has sold over 500,000 copies. It saw a resurgence in sales after Collective Soul began putting out albums on their own independent label, El Music Group, beginning in 2004.
Seven Year Itch was the last album Collective Soul released through Atlantic Records and their last album to feature guitarist Ross Childress, who had been with the band since its 1993/1994 debut.
"Energy" is the second single by Canadian rapper Drake from his fourth commercial release If You're Reading This It's Too Late.
"Energy" contains samples from Eazy-Duz-It performed by Eazy-E and Ridin Spiners performed by Three 6 Mafia. Energy was produced by Boi-1da and OB O'Brien. According to WhoSampled the song samples the score of an episode of The O.C..
"Energy" received acclaim from music critics with many calling it the best song of the album. Ryan Dombal of Pitchfork gave the song a positive review and named it "Best New Track", stating "The song isn't aimed to any rappers or pop stars, not Kendrick Lamar, Big Sean or Tyga, but the song lines are dangerous."
The video of "Energy" was released on Apple Music and users with iTunes and registered Apple Music account can watch this video.
The Britons were an ancient Celtic people who lived in Great Britain from the Iron Age through the Roman and Sub-Roman periods. They spoke a language that is now known as Common Brittonic.
The earliest evidence of the existence of the Britons and their language in historical sources dates to the Iron Age. After the Roman conquest of Britain in the 1st century, a Romano-British culture emerged, and Latin and British Vulgar Latin coexisted with Brittonic. During and after the Roman era, the Britons lived throughout Britain south of the Firth of Forth. Their relationship with the Picts, who lived north of the Firth of Forth, has been the subject of much discussion, though most scholars accept that the Pictish language was related to Common Brittonic.
With the beginning of Anglo-Saxon settlement in the 5th century, the culture and language of the Britons fragmented and much of their territory was taken over by the Anglo-Saxons. The extent to which this cultural and linguistic change was accompanied by wholesale changes in the population is still a matter of discussion. During this period some Britons migrated to mainland Europe and established significant settlements in Brittany (now part of France) as well as Britonia in modern Galicia, Spain. By the 11th century, remaining Celtic-speaking populations had split into distinct groups: the Welsh in Wales, the Cornish in Cornwall, the Bretons in Brittany, and the people of the Hen Ogledd ("Old North") in southern Scotland and northern England. Common Brittonic developed into the distinct Brittonic languages: Welsh, Cumbric, Cornish and Breton.
British people, or Britons, are the citizens of the United Kingdom, British Overseas Territories, and Crown Dependencies; and their descendants.British nationality law governs modern British citizenship and nationality, which can be acquired, for instance, by descent from British nationals. When used in a historical context, British people refers to the ancient Britons, the indigenous inhabitants of Great Britain south of the Forth.
Although early assertions of being British date from the Late Middle Ages, the creation of the united Kingdom of Great Britain in 1707 triggered a sense of British national identity. The notion of Britishness was forged during the Napoleonic Wars between Britain and the First French Empire, and developed further during the Victorian era. The complex history of the formation of the United Kingdom created a "particular sense of nationhood and belonging" in Great Britain and Ireland; Britishness became "superimposed on much older identities", of English, Scots, Welsh and Irish cultures, whose distinctiveness still resists notions of a homogenised British identity. Because of longstanding ethno-sectarian divisions, British identity in Ireland is controversial, but it is held with strong conviction by unionists.
The term Britain is a linguistic descendant (reflex) of one of the oldest known names for Great Britain, an island off the north-western coast of continental Europe. The terms Briton and British, similarly derived, refer to its inhabitants and, to varying extents, the smaller islands in the vicinity. "British Isles" is the only ancient name for these islands to survive in general usage. Its first written appearance was by Pytheas of Massalia in the 4th century BC. It originates with a group of P-Celtic speakers, resident on Great Britain, who were referred to, and perhaps referred to themselves, by the earliest known form of the term "British".
"Britain" comes from Latin Britannia~Brittania, via Old French Bretaigne and Middle English Breteyne, possibly influenced by Old English Bryten(lond), probably also from Latin. The earliest known written references to the British Isles derive from the works of the Greek explorer Pytheas of Massalia; later Greek writers such as Diodorus of Sicily and Strabo who quote Pytheas use variants such as Prettanikē, "The Britannic [land, island]", and nesoi Brettaniai, "Britannic islands".