Watt (W)
- Watt definition
- Table of unit prefixes of watt
- How to convert watts to kilowatts
- How to convert watts to milliwatts
- How to convert watts to dBm
- How to convert watts to amps
- How to convert watts to volts
- How to convert watts to ohms
- How to convert watts to btu
- How to convert watts to joules
- How to convert watts to horsepower
- How to convert watts to kVA
- How to convert watts to VA
- Power consumption table
Watt definition
Watt is the unit of power (symbol: W).The watt unit is named after James Watt, the inventor of the steam engine.
One watt is defined as the energy consumption rate of one joule per second.
1W = 1J / 1s
One watt is also defined as the current flow of one ampere with voltage of one volt.
1W = 1V × 1A
Table of unit prefixes of watt
| name | symbol | conversion | example |
|---|---|---|---|
| picowatt | pW | 1pW = 10-12 W | P = 10 pW |
| nanowatt | nW | 1nW = 10-9 W | P = 10 nW |
| 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 |
| gigawatt | GW | 1GW = 109 W | P = 5 GW |
How to convert watts to kilowatts
The power P in kilowatts (kW) is equal to the power P in watts (W) divided by 1000:
P(kW) = P(W) / 1000
How to convert watts to milliwatts
The power P in milliwatts (mW) is equal to the power P in watts (W) times 1000:
P(mW) = P(W) · 1000
How to convert watts to dBm
The power P in decibel-milliwatts (dBm) is equal to 10 times base 10 logarithm of the power P in milliwatts (mW) divided by 1 milliwatt:
P(dBm) = 10 · log10( P(mW) / 1mW)
How to convert watts to amps
The current I in ampers (A) is equal to the power P in watts (W) divided by the voltage V in volts (V):
I(A) = P(W) / V(V)
How to convert watts to volts
The voltage V in volts (V) is equal to the power P in watts (W) divided by the current I in ampers (A):
V(V) = P(W) / I(A)
How to convert watts to ohms
R(Ω) = P(W) / I(A)2
R(Ω) = V(V)2/ P(W)
How to convert watts to btu/hr
P(BTU/hr) = 3.412142 · P(W)
How to convert watts to joules
E(J) = P(W) · t(s)
How to convert watts to horsepower
P(HP) = P(W) / 746
How to convert watts to kVA
The real power P in watts (W) is equal to 1000 times the apparent power S in kilo-volt-amperes (kVA) times the power factor (PF) or cosine of the phase angle φ:
P(W) = 1000 · S(kVA) · PF = 1000 · S(kVA) · cos φ
How to convert watts to VA
The real power P in watts (W) is equal to the apparent power S in volt-amperes (VA) times the power factor (PF) or cosine of the phase angle φ:
P(W) = S(VA) · PF = S(VA) · cos φ
Power consumption of some electrical components
How many watts does a house use? How many watts does a TV use? How many watts does a refrigerator use?| Electric component | Typical power consumption in watts |
|---|---|
| LCD TV | 30..300 W |
| LCD monitor | 30..45 W |
| PC desktop computer | 300..400 W |
| Laptop computer | 40..60 W |
| Refrigerator | 150..300 W (when active) |
| Light bulb | 25..100 W |
| Fluorescent light | 15..60 W |
| Halogen light | 30..80 W |
| Speaker | 10..300 W |
| Microwave | 100..1000 W |
| Air conditioner | 1..2 kW |
See also
- Electric power
- Decibel-milliwatt (dBm)
- Decibel-watt (dBW)
- Kilowatt (kW)
- Kilowatt-hour (kWh)
- Volt (V)
- Ampere (amps)
- Ohm
- Ohm's law
- Power conversion
- Watts to kW conversion
- Watts to mW conversion
- Watts to dBm conversion
- Watts to Horsepower conversion
- Watts to BTU/hr conversion
- Energy conversion
- Watts to Amps calculation
- Watts to Joules calculation
- Watts to Volts calculation
- Electrical units
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