Picowatt vs. Watt — What's the Difference?

One million millionth (10^-12) of a watt, abbreviated as pW.

The watt (symbol: W) is a unit of power or radiant flux. In the International System of Units (SI), it is defined as a derived unit of (in SI base units) 1 kg⋅m2⋅s−3 or, equivalently, 1 joule per second.

The SI unit of power, equivalent to one joule per second, corresponding to the rate of consumption of energy in an electric circuit where the potential difference is one volt and the current one ampere.

An SI-derived unit of power equal to one joule per second. See Table at measurement.

In the International System of Units, the derived unit of power; the power of a system in which one joule of energy is transferred per second. Symbol: W

A unit of power or activity equal to 107 C.G.S. units of power, or to work done at the rate of one joule a second. An English horse power is approximately equal to 746 watts.

A unit of power equal to 1 joule per second; the power dissipated by a current of 1 ampere flowing across a resistance of 1 ohm

Scottish engineer and inventor whose improvements in the steam engine led to its wide use in industry (1736-1819)