A power tool is a tool that is actuated by an additional power source and mechanism other than the solely manual labour used with hand tools. The most common types of power tools use electric motors. Internal combustion engines and compressed air are also commonly used. Other power sources include steam engines, direct burning of fuels and propell... Found on http://en.wikipedia.org/wiki/Power_tool
(from the article `hand tool`) A power tool is technically a power-driven hand tool or portable power tool; these names distinguish it from the stationary power tool such as the ... Found on http://www.britannica.com/eb/a-z/p/103