if E=12V, I=6A; [ 2 ] ? 1.4. power Power is measured in watts (http://en.wikipedia.org/wiki/Watt), with the symbol w . The unit is named after James Watt (http://en.wikipedia.org/wiki/James_Watt), who improved the Newcomen steam engine, producing the condensing steam engine. This engine powered the Industrial Revolution which gave millions of unemployed children, no