Watt (W)

Watt is the unit of electric power (symbol W).

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 one second.

 

1W = 1V · 1A = 1J / 1s

Table of power values of Watt

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

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	30-80 W
Speaker	10 - 300 W
LED	100 mW

 

Kilowatt (kW) ►

 

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See also

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