Question

what is the relation between "watt" and a "joule" ?​

Answer 1

Answer:

Joule is unit of energy as well as work. ... On the other hand, Watt is the unit of 'power', which is energy per unit time (Joules per second). So the amount of energy is measured in Joules, while the rate of the flow of this energy is measured in Watts.

Answer 2

Explanation:

A watt equals a joule per second. If a smart phone uses five joules of energy every second, then the power of the phone is five joules per second, or five watts.