Watt (electric power)

Watt is the unit of electric power.

The Watt unit is named after James Watt, who invented the steam engine.

One watt is defined as energy consumption rate of one joule per second.

 

1W = 1V · 1A = 1J / 1s

Table of power values of Watt

name	symbol	conversion	example
microwatt	μW	1μW  = 10-6W	P1=10μW
milliwatt	mW	1mW = 10-3W	P1=10mW
watt	W	-	P1=10W
kilowatt	kW	1kW   = 103W	P1=2kW
megawatt	MW	1MW  = 106W	P1=5MW

Power consumption of some electrical components

Electric component	Typical power consumption in watts
Light bulb	25-100 W
Fluorescent light	15-60 W
Halogen light	30-80W
Speaker	10 - 300W
LED	100mW

 

---

See also

• Electric power
• Power conversion
• Energy conversion
• Volt
• Ampere (amps)
• Ohm
• Ohm's law
• Electronics units
• Watt - Wikipedia