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# Calculate power consumption

Discuss Calculate power consumption in the Electrical Forum area at ElectriciansForums.net

A

#### ashokkumar8226

Welcome to ElectriciansForums.net - The American Electrical Advice Forum

Hi,

i have projector voltage is 110-240v and max power 300w what will be the consumption of power in one hour and what is the load it requires.

Thanks & regards

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#### Mr Mark Sparks

##### -
1000w is about 4.2 amps at 230v
cost to run at say10p per kwh
about 3.5p an hour/84p for 24 hours
basicly not very much
hpoe this helps

D

#### DanBrown

1000w is about 4.2 amps at 230v
cost to run at say10p per kwh
about 3.5p an hour/84p for 24 hours
basicly not very much
hpoe this helps
Mark, could you please explain where the 1.3 amp comes from?
and also the 3.5p an hour?.

Thanks

N

#### Nenedata

Mark, could you please explain where the 1.3 amp comes from?

He's basically simplified calculation by using the figure of 1000w and then used the % of 300w from 1000w thus being 30%. 30% of 4.2amp is 1.3amp.

Mark

G

#### Guest123

Hey Dan.

the 1.3 A is the current used by the 300W load in the original example - 300W/230V - 1.3A, power triangle.

Then divide 1 kwh by the 300W load to get a sum of 3.33p per hour roghly rounded up to 3.5p.

Hope this helps.

#### Mr Mark Sparks

##### -
i wondered why my ears were burning

G

Sorry mate.

#### Mr Mark Sparks

##### -
no bother mate i only wish i understood the phasor/vector stuff on the therory help posts i qualified in 94 and that sort of thing is long gone.

G

#### Guest123

Ne bother.

It is amazing though how much we were taught and how much we actually use in day to day life. Forgetting it is a dam sight easier than learning it ever was and trying to remember it again is even worse.

Cheers.

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