Switch

In electrical engineering, a switch is an electrical component that can break an electrical circuit, interrupting the current or diverting it from one conductor to another. The mechanism of a switch may be operated directly by a human operator to control a circuit (for example, a light switch or a keyboard button), may be operated by a moving object such as a door-operated switch, or may be operated by some sensing element for pressure, temperature or flow. A relay is a switch that is operated by electricity. Switches are made to handle a wide range of voltages and currents; very large switches may be used to isolate high-voltage circuits in electrical substations.

Description

The most familiar form of switch is a manually operated electromechanical device with one or more sets of electrical contacts, which are connected to external circuits. Each set of contacts can be in one of two states: either "closed" meaning the contacts are touching and electricity can flow between them, or "open", meaning the contacts are separated and the switch is nonconducting. The mechanism actuating the transition between these two states (open or closed) can be either a "toggle" (flip switch for continuous "on" or "off") or "momentary" (push-for "on" or push-for "off") type.

The Tonight Show

The Tonight Show is an American late-night talk show broadcast from the Rockefeller Center in New York City and airing on NBC since 1954. It is the world's longest-running talk show, and the longest running, regularly scheduled entertainment program in the United States. It is the third-longest-running show on NBC, after only the news-and-talk shows Today and Meet the Press.

Over the course of more than 60 years, The Tonight Show has undergone only minor title changes. It aired under the name Tonight for several of its early years, eventually settling on The Tonight Show after the seating of long-time host Johnny Carson in 1962. In later decades, network programmers, advertisers, and the show's announcers would refer to the show by including the name of the host; for example, it is currently announced as The Tonight Show Starring Jimmy Fallon. In 1957, the show briefly tried a more news-style format. It has otherwise remained a talk show throughout its run.

The Tonight Show began broadcasting in 1954. It has had six official hosts, beginning with Steve Allen (1954–57), followed by Jack Paar (1957–62), Johnny Carson (1962–92), Jay Leno (1992–2009, 2010–14), Conan O'Brien (2009–10), and Jimmy Fallon (2014–present). It has had several recurring guest hosts, a practice especially common during the Paar and Carson eras.

Iggy Azalea

Amethyst Amelia Kelly (born 7 June 1990), better known by her stage name Iggy Azalea (/əˈzeɪljə/), is an Australian rapper, songwriter, and model. Born in Sydney and raised in Mullumbimby, Azalea moved to the United States at the age of 16 to pursue a career in hip hop music, residing in the southern part of the country. She earned public recognition after releasing YouTube music videos for her songs "Pu$$y" and "Two Times". She signed a record contract with T.I.'s record label Grand Hustle in 2012, gaining attention from her debut mixtape Ignorant Art.

Her debut studio album, The New Classic (2014), peaked among the top five of several charts worldwide and received generally mixed reviews. The album spawned five singles: "Work", "Bounce", "Change Your Life", "Fancy" and "Black Widow". "Fancy" topped the Billboard Hot 100 chart for seven consecutive weeks, making Azalea the fourth female rapper in the history of the chart to reach number one. Additionally, Azalea was featured on Ariana Grande's single "Problem", which peaked at number two while "Fancy" was number one; Azalea joined The Beatles as the only acts to rank at numbers one and two simultaneously with their first two Hot 100 entries. Azalea also went on to pass Lil' Kim as the female rapper with the longest-leading number-one single on the Billboard Hot 100.

Jimmy Fallon

James Thomas "Jimmy" Fallon (born September 19, 1974) is an American comedian, television host, actor, singer, writer, and producer. He is known for his work in television as a cast member on Saturday Night Live and as the host of late-night talk show The Tonight Show Starring Jimmy Fallon. He was born in Bay Ridge, Brooklyn and raised in Saugerties, New York. He grew up with an interest in comedy and music, moving to Los Angeles at 21 to pursue stand-up opportunities.

He was commissioned to join NBC's Saturday Night Live as a cast member in 1998, fulfilling a lifelong dream. Fallon remained on SNL for six years between 1998 and 2004, co-hosting the program's Weekend Update segment and becoming a celebrity in the process. He left the program for the film industry, starring in films such as Taxi (2004) and Fever Pitch (2005). Following his film career, Fallon returned to television as the host of Late Night with Jimmy Fallon on NBC in 2009, where he became well known for his emphasis on music and games. He transitioned from that program to become the sixth host of the long-running The Tonight Show in 2014.