# Definition: Watt

# Watt

A unit of measure for power, which measures the rate of energy conversion; equal to one joule per second (or 1/746 horsepower); equivalent to one ampere under a pressure of one volt.^{[1]}^{[2]}

### Wikipedia Definition

- The watt (symbol: W) is a derived unit of power in the International System of Units (SI), named after the Scottish engineer James Watt (1736–1819). The unit is defined as 1 joule per second and can be used to express the rate of energy conversion or transfer with respect to time. It has dimensions of Mass·Length2·Time−3.

- Also Known As
- W

- Related Terms
- Electricity, Power, Kilowatt

##### References

- ↑ http://www.eia.gov/tools/glossary/index.cfm?id=W#watt
- ↑ http://needtoknow.nas.edu/energy/glossary/