watts
n. C / U B2 Upper Intermediate US //ˈwɑts// UK //wˈɒts// watts
n. a unit used to measure how much electrical power a device uses or produces.
n. the SI unit of power, equivalent to one joule per second, used to quantify the rate of energy transfer.
This light bulb uses only nine watts of power.
The back of the microwave shows how many watts it uses to heat food quickly.
Engineers must calculate the total watts required by the data center to ensure the backup generators can handle the load during a power failure.
Usage
Usually plural when referring to a specific measurement; uncountable when referring to the general concept of power capacity.