> Watts are a measure of energy, just different units than calories or BTU. Sorry to be pedantic, but watts are a unit of power, not energy. Power is energy di

> Watts are a measure of energy, just different units than calories or BTU. Sorry to be pedantic, but watts are a unit of power, not energy. Power is energy divided by time. The unit of energy is a joule (or, more commonly in household terms, a Watt-hour).