Maths Question

[whistonian]

What would be the cost of running a 3.8kw gas fire for 10 hours.
Cost of gas is £2.12 per cu.meter ie 55 pence per litre.??

[mikey4444]

Flipping heck...its a bit early for really hard questions isn't it whistonian ?

Well, if the fire is on max through the 10 hours, than it will be giving out 3.8kw times 10 = 38kw. But I'm not sure how to proceed from here !

[bhg481]

You need to know the thermal value of your gas ie, how many litres per kw. The information should be on your gas bill. If this is an exam question there is information missing.

[Peter Pedant]

agree bhg - whose name looks a bit like British Thermal Unit - how I loved them !
so far no one has noticed that £2.12 / cu meter is 212p / m3 is 212p / 1000li is 0.212p / li
( one cu m is 1000 li )

This is info available on the gas bill and I know I have just shredded mine after paying of course. we need the said gas conversion factor see above

i dont think this is a skool prob - I think someone has just left one on for 10 h hasnt he ?

[Peter Pedant]

0.2 p / li sounds cheap but you dont get much out of a litre of N S gas

[gingejbee]

Something's wrong in your original figures....for starters, there are 1000 litres in a cubic metre!

[Peter Pedant]

The BG site is confused... " kWh in cu ft" um... yeah

but look at this:
http://energylinx.co.uk/gas_meter_conversion_meters.html

I used ten ( metric huh ? )

10 cu metres gives 114 kwh at a cost of £5.93

O god it is like ratio questions as an eleven y old - we want 38 kWh

say a third - so that is around 3.3 cu m gives 38 kwh for around two knicker. ( not a great calculator man myself )

[Graham-W]

My gas is charged at 4.55p per Kwhour. Using this figure:
3.8*10*4.55=172.9p or £1.73.

[whistonian]

The above info is supplied from my last years gas bill as supplied by the owners of our static camp site.Without actually watching the outside gas meter I wondered if it was possible to calculate how long it takes the fire to use up 1 cubic metre. It's LPG gas piped direct to the van,very expensive to use.
I was hoping to compere it against running 2 1.5 KWH oil radiators which costs 10.11 per Kwh ie 10hrs at 10.11 x 2 = 202.20p .Of course the radiators cut out so cost would be slightly less.
Hope this makes sense.

Ref my original question I guess I would have to keep watch to see how long it would take to use up 1 cubic metre.

[Graham-W]

Using Peter's figures it comes out at £2.10 so we are both in the right ball park.

[whistonian]

Blimey there's enough calculations above to make my geriatric head hurt.lol

[Peter Pedant]

hey graham we agree !

dja know the story of Fred Hoyle being asked by a student - disaster Prof Hoyle my estimate of the universe is a billion times too small -
Hoyle - hey lets have a look -here do this and that - and hey presto
Later - - Prof Hoyle my estimate was wrong - but it was a billion times too LARGE !
Hoyle: lets have a look ! do this and that.....

[Graham-W]

It looks like six of one and half a dozen of the other.

[jomifl]

Do you mean electric radiators, not paraffin powered?

[whistonian]

Yes electric oil filled radiators jomifl.

[Peter Pedant]

we think the charge is two quid Whistonian

So if your tenants do a week end and use the fire then it is an extra 6 quid on the bill. Mounts up tho

Jomifl - doncha mean paraffin powered from the local nuclear power station ? I know you are heavily into long sums and so on.

[whistonian]

Thanks everyone for your replies,guess I got a few brains active this morning.I don't do Tenants Peter,it's mine and my OH's hideaway for the summer.