Cost for Charging devices....?

[Heliospherez]

Just had a look at all the things charging in our house and was curious about the following, after an argument about mobile phone charging.

One of the mates thinks it costs about £20 a year if you leave you mobile charging every night.

I have the following charging or plugged in and using leccy every night.


1.) Mobile.
2.) Wifes Mobile
3.) Baby Monitor sender
4.) Baby monitor Receiver.
5.) PSP.
6.) Digi Camera.
7.) Re-chargeable battery charger (with 4AAs).

I cant find any rough cost figures for mobiles, but most of the above are on charge every night of the year...so what is the cost "roughly" for each ?

 

[cheets64]

You can get a plug that counts how much something costs when its pluged in.

 

[Heliospherez]

I have one, but for some reason, it doesn't measure things below a specific amp / wattage (and each of these doesn't register ) - so it ain't any good to me.

Thing is if they are each using only 5p a day - that works out to be a fair bit over a year. I just don't think its that much. Think its more like 5 or 10p a year for each.

 

[Glaucus]

get a multiple plug adapter, and plug them all into your watt counter and see what there combined useage is.

It aint going to be £20 a year each.

 

[Gaverick]

Hopefully these calculations are correct

Power = Voltage x Current

My phone charger is 4.9V and 450x10^-3A

4.9 x 450x10^-3 = 2.205W

1 kwh = 3600000J

3600000 / 2.205 = 1632653 seconds = 453 hours

Therefore you would need to charge your phone for 453 hours to use one kwh.

I think 1 kwh is around 20p these days.

So say you put your phone on to charge at 10pm and take it out at 7am that's 9 hours. 50 days of doing that would use 1 kwh.

You have 7 devices, say they all have about the same values as the phone charger. 50 / 7 = 7 days to use 1 kwh

365 / 7 = 52 kwh's therefore 52 x 20p = £10.40

Probably totally wrong but it was fun typing

 

[sbi5ar]

Simplifying the above for those who looked and thought wtf

£10.40 a year