Insulators have high resistance and conductors have low resistance. Ohm's Law Named after the German physicist Georg Ohm who in 1827 described resistance to electrical flow. Expresses the fundamental relationship between voltage, current, and resistance. The amount of work being done. It is named after James Watt a Scottish engineer, 1736-1819.
Electric power is simply the product of voltage times current.
Photovoltaic or PV - Photoelectric, light electric, or solar electric. The space race of the late 50's forward gave PV's a niche that they have filled ever since. Because space has unlimited sunlight and PV's are autonomous power sources and are lightweight they have powered all of America's satellites, from the tiny Vanguard to the very large Skylab. Unfortunately the government spent very little on research and development to make better and cheaper PV's, though it spent billions to develop nuclear power. Silicon PV Cell A device that converts sunlight directly into electricity.