**Real Power (P) in Watts (W)**

**What is a Watts?**

A watt is a measure of the rate of energy transfer over a unit of time, with 1 watt equal to 1 Joules (J) per second:

A single Watt (W) is equivalent to 1 joule (J) per second (S), where a Joule is a unit of measurement of the energy.

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**What is the meaning of 1 watts?**

**1 Joule per second**

Watts are defined as 1 Watts equal 1 Joule per second (1W = 1 J/s). **example** that 1 kW = 1000 J/s. A Watt is the amount of energy (in Joules) that an electrical device (such as a light) is burning per second that it’s running. So a 100W Light is burning 100 Joules of energy every second you have it turned on.

**How is 1000 watt?**

1000w equals 1 Kw. When you run a 1000W appliance for an hour you use one unit (kilowatt hour) of electricity. 1 unit of electricity will run a 2000W water heater for 30 minutes or a 100W light for 10 hours.

An Ampere meter or ammeter is an electrical instrument that is used to measure electrical current flow in amperes.

When we want to measure the amperes and the electrical current on the load, the ampere meter is connected in a series of single lines to the load.

The resistance value of the ampere-meter is near zero, so it will not affect the measured circuit.

**Watts definition**

The watt is the unit of power (symbol: W).

The Watt unit is named after James Watt, the inventor of the steam engine.

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

1W = 1J / 1s

5 watts is also defined as the Current flow of 5 amperes with a voltage of 5 volts.

5W = 5V × 5A

**Watts unit Prefixes of Information**

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 = 10^{3 }W |
P = 2 kW |

megawatt | MW | 1MW = 10^{6 }W |
P = 5 MW |

gigawatt | GW | 1GW = 10^{9 }W |
P = 5 GW |

**How to convert watts to kilowatts (KW)**

The Real Power (P) in kilowatts (kW) is equal to the Real power (P) in watts (W) divided by 1000:

*P*_{(kW)} = *P*_{(W)} / 1000

**How to convert watts to milliwatts (mW)**

The Real power (P) in milliwatts (mW) is equal to the Real power (P) in watts (W) times 1000:

*P*_{(mW)} = *P*_{(W)} × 1000

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**How to convert watts to dBm**

The Real power (P) in decibel-milliwatts (dBm) is equal to 10 times the base 10 logarithm of the Real power (P) in milliwatts (mW) divided by 1 milliwatt:

*P*_{(dBm)} = 10 × log_{10}( *P*_{(mW)} / 1mW)

**How to convert watts to amps**

The current (I) in amperes (A) is equal to the Real 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 Real Power P in watts (W) divided by the current I in amperes (A):

*V*_{(V)} = *P*_{(W)} / *I*_{(A)}

**How to convert watts to ohms**

The Resistor R in ohms (Ω) is equal to the power P in watts (W) divided by the current I in amperes (A) square:

*R*_{(Ω)} = *P*_{(W) }*/ I*_{(A)}^{2}

The Resistor R in ohms (Ω) is equal to the Voltage V in Volt (V) square divided by the Real power P in watts (W) :

*R*_{(Ω)} = *V*_{(V)}^{2}/* P*_{(W)}

**How to convert watts to btu/hr**

The Real power P in BTU per hour is equal to the 3.412142 Real Power P in watts (W).

*P*_{(BTU/hr)} = 3.412142 × *P*_{(W)}

**How to convert watts to joules**

The Energy E in joules is equal to the Real power P in watts times the time t in seconds.

*E*_{(J)} = *P*_{(W)} × *t*_{(s)}

**How to convert watts to horsepower (hp)**

The Real Power P in horsepower (HP) is equal to the Real power P in watts (W) divided by the 746:

*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*

**Electrucal Components of Power consumption**

Electric Component | Power Consumption in watts |
---|---|

Desktop Computer | 80w to 500w |

Laptop Computer | 20w to 80w |

Refrugerator | 150w to 400w |

Light | 6w to 100w |

Fluorescent light | 20w to 80w |

Microwave | 200w to 2000w |

Air conditioner | 1000w to 3000w |

Speaker Box | 20w to 300w |

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