The watt is the SI derived unit of power. It expresses the rate of energy transfer.
The watt became the standard language for power ratings across electrical and mechanical engineering.
Measurement system: International System of Units (SI). SI equivalent: Base SI power unit.
Watt facts
- Unit name
- Watt
- Symbol
- W
- Category
- Power
- Measurement system
- International System of Units (SI)
- SI equivalent
- Base SI power unit
- Common uses
- Device ratings, electrical loads and motor power
Definition of the watt
The watt is the SI derived unit of power. It expresses the rate of energy transfer.
Measurement system and SI relationship
International System of Units (SI)
SI equivalent: Base SI power unit
History of the watt
The watt became the standard language for power ratings across electrical and mechanical engineering.
Where is the watt used?
Device ratings, electrical loads and motor power