Joule (J)

The joule is the SI unit of energy, work, and heat. One newton of force acting along one metre of displacement does one joule of work. The relation $1\mathrm{J}=1\mathrm{N}\mathrm{m}$ makes mechanical and electrical transfers comparable in the same energy unit. ^[ref]

A joule (symbol: J) is the unit of energy in the International System of Units (SI). It is defined as the amount of energy transferred when one newton of force is applied over a distance of one meter.