The volt is defined as the potential difference across a conductor when a current of one ampere dissipates one watt of power. Hence, it is has the base SI representation m2 · kg · s-3 · A-1, which can be equally represented as one joule of energy per coulomb of charge, J/C.
Since 1990 the volt is maintained internationally using the Josephson effect, where a conventional value is used for the Josephson constant, fixed by the 18th CGPM as
In the bigger scheme of things, the Volt saves the environment some 4.4 metric tons of carbon dioxide that might otherwise be emitted into the air in a year, GM claims.
Instead of a large battery and small engine like in the Volt, it would have a fuel-cell propulsion system with a small battery to capture energy from a regenerative braking system, and would need only half of the hydrogen storage of the original Sequel concept to achieve 300 miles of range.
The Volt accelerates from a dead stop to 60 mph in less than 8.5 seconds (the EV1 took about a second longer), and has a top speed of 120 mph.
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