The volt (symbol: V) is the SI derived unit for electric potential, electric potential difference, and electromotive force. The volt is named in honor of the Italian physicist Alessandro Volta (1745–1827), who invented the voltaic pile, possibly the first chemical battery.

A single volt is defined as the difference in electric potential across a wire when an electric current of one ampere dissipates one watt of power. It is also equal to the potential difference between two parallel, infinite planes spaced 1 meter apart that create an electric field of 1 newton per coulomb. Additionally, it is the potential difference between two points that will impart one joule of energy per coulomb of charge that passes through it. It can be expressed in terms of SI units as follows:

It can also be written using only the SI base units m, kg, s, and A as:

Between 1990 and 1997, the volt was calibrated using the Josephson effect for exact voltage-to-frequency conversion, combined with cesium-133 time reference, as decided by the 18th General Conference on Weights and Measures. The following value for the Josephson constant is used:

David Blaine (born David Blaine White; April 4, 1973) is an American illusionist and endurance artist. He is best known for his high-profile feats of endurance, and has made his name as a performer of street and close-up magic. He has set and broken several world records. Theatre owner James Nederlander as well as The New York Times have referred to Blaine as a modern day Houdini.

Blaine was born and raised in Brooklyn, New York and is of Puerto Rican descent on his father's side, and Russian Jewish on his mother's. His mother, Patrice Maureen White (1946–1995), was a school teacher living in New York, and his father William Perez was a Vietnam veteran. When he was four years old, he saw a magician performing magic in the subway. This sparked an interest in Blaine. He was raised by his single mother and attended many schools in Brooklyn. When he was ten years old, his mother married John Bukalo and they moved to Little Falls, New Jersey, where he attended Passaic Valley Regional High School. He has a half-brother named Michael James Bukalo. When he was 17 years old, Blaine moved to Manhattan, New York.