Joule (J) is the unit of energy which is used by International Standard of Units (SI). It is defined as the amount of work done by a force of one Newton acting on an object that moves over a distance of one meter.
Watts is a combination of Amps and volts. Watts is a measurement of the amount of energy being released. The higher the wattage is, the more power and output from the appliance.
Joules to watts calculation formula:
The power (P) in watts (W) is equal to the energy (E) in joules (J), divided by the time period t in seconds (s):
P(W) = E(J) / t(s)
watt = joule / second
W = J / s