# For what loads, active power turns negative?

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#### alphacat

##### New Member
And what is the meaning of negative active power?

Thank you.

#### Willbe

##### New Member
For an arc, it may mean when an incremental increase in V brings an incremental decrease in I.

#### alphacat

##### New Member
Could you please give a practical example that I'd really measure negative active power on a certain load?

#### crutschow

##### Well-Known Member
Don't really understand your question. Where have you found the term "negative active power"? Are you referring to a "negative power factor"?

#### Willbe

##### New Member
Could you please give a practical example that I'd really measure negative active power on a certain load?
Nah, that was my best shot. . .

##### Banned
The only thing that makes sense is a generator.
Negative active power is when the 'load' is an electrical generator.

#### alphacat

##### New Member
Don't really understand your question. Where have you found the term "negative active power"? Are you referring to a "negative power factor"?
If AP = V*I * PF, where V*I >=0, then AP < 0 if and only if PF < 0.
Didnt think i'd need to explain it.

#### alphacat

##### New Member
The only thing that makes sense is a generator.
Negative active power is when the 'load' is an electrical generator.
SO any load would give possitive active power?

#### Tesla23

##### Member
If AP = V*I * PF, where V*I >=0, then AP < 0 if and only if PF < 0.
Didnt think i'd need to explain it.
If the power factor is negative then the average power is flowing the wrong way. As Sceadwian says, the load is a generator (or at least something capable of supplying power).

e.g. your electricity company supplying power to your house would see a negative power factor if you have a solar supply and it is supplying power to the grid.

#### Willbe

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##### Banned
Alphacat, any electric motor under the right conditions can produce energy rather than use it, so any electric motor as a load in theory can produce power rather than use it. Under any normal circumstances however motors draw power not generate it.

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