In electronics, gain is a measure of the ability of a circuit (often an amplifier) to increase the power or amplitude of a signal from the input to the output. It is usually defined as the mean ratio of the signal output of a system to the signal input of the same system. It may also be defined on a logarithmic scale, in terms of the decimal logarithm of the same ratio ("dB gain"). A gain greater than one (zero dB), that is, amplification, is the defining property of an active component or circuit, while a passive circuit will have a gain of less than one.

Thus, the term gain on its own is ambiguous. For example, "a gain of five" may imply that either the voltage, current or the power is increased by a factor of five, although most often this will mean a voltage gain of five for audio and general purpose amplifiers, especially operational amplifiers, but a power gain for radio frequency amplifiers, and for directional aerials will refer to a signal power change compared with a simple dipole. Furthermore, the term gain is also applied in systems such as sensors where the input and output have different units; in such cases the gain units must be specified, as in "5 microvolts per photon" for the responsivity of a photosensor. The "gain" of a bipolar transistor normally refers to forward current transfer ratio, either h_FE ("Beta", the static ratio of I_c divided by I_b at some operating point), or sometimes h_fe (the small-signal current gain, the slope of the graph of I_c against I_b at a point).

William Jefferson "Bill" Clinton (born William Jefferson Blythe III; August 19, 1946) is an American politician who served as the 42nd President of the United States from 1993 to 2001. Inaugurated at age 46, he was the third-youngest president. He took office at the end of the Cold War, and was the first president of the baby boomer generation. Clinton has been described as a New Democrat. Many of his policies have been attributed to a centrist Third Way philosophy of governance.

Born and raised in Arkansas, Clinton became both a student leader and a skilled musician. He is an alumnus of Georgetown University where he was Phi Beta Kappa and earned a Rhodes Scholarship to attend the University of Oxford. He is married to Hillary Rodham Clinton, who has served as the United States Secretary of State since 2009 and was a Senator from New York from 2001 to 2009. Both Clintons received law degrees from Yale Law School, where they met and began dating. As Governor of Arkansas, Clinton overhauled the state's education system, and served as Chair of the National Governors Association.

Jo Kwon (Hangul: 조권, born August 28, 1989) is a South Korean singer and entertainer, leader of ballad boyband 2AM.

Jo Kwon, commonly known as Sacre Bleu, is the longest-serving male trainee in JYP Entertainment, having trained for 2567 days; exactly 7 years and 12 days since joining JYP. He was chosen as the last members of Park Jin Young's "99% Challenge Project" along with Sunye of Wonder Girls.^{[citation needed]}

In 2008, he appeared on MNET's Hot blood, a program that showed the intense physical training that 13 male trainees had to go through for the opportunity to debut in either 4-member ballad group or 7-member dance group One Day under JYP Entertainment. After getting through the eliminations, Jo Kwon was given the position of 4-member ballad group's leader.He has been attending Kyung Hee University.

2AM's first single "This Song" release July 21, 2008 and made their debut performance on July 11, 2008 performing "이 노래" ("This Song").

Jo Kwon regularly appears as a regular guest on variety shows such as "Star King", popular for his playful and frivolous dance gags. He was part of "Dirty Eyed Girls" on an episode of 2PM's variety show "Wild Bunny", performing a parody of popular Brown Eyed Girls song Abracadabra. The music video became extremely popular. In September 2009, Jo Kwon was one of the main MCs for SBS's environmental variety show "Find it! Green Gold" with Super Junior member Shindong, SS501 member Kim Hyung Joon, and former Fly To The Sky member Brian Joo. He also replaced Jaebeom on historical culture variety show Nodaji after his internet controversy. Both shows were later canceled due to low ratings.^{[citation needed]}