Would anyone be able to answer this physics question for me. It is not a homework question, I had a gcse in physics today and it came up and I wanna know whether I got the right answer:
Getting solar panels installed costs £10000. It produces 0.2kW (on average) It has a lifetime of 200000 hours. How much does each kWh of elecricity cost?
Cheers, dom
2007-06-25 04:33:30 · 7 answers · asked by footie089 1 in Science & Mathematics ➔ Physics
0.2 * 200000 = 40000 kWh.
So, £0.25 per kWh.
2007-06-25 04:37:59 · answer #1 · answered by ? 7 · 0⤊ 0⤋
Total numberof kWh produced = 0.2 x 200000
= 40,000kWh
Total cost =£10,000
Cost per unit = total cost/ total produced
= 10,000/ 40,000
Therefore cost per unit = £0.25
=25p
2007-06-25 21:52:02 · answer #2 · answered by Andy B 2 · 0⤊ 0⤋
During its life it will generate 0.2 * 200,000 = 40,000 kW Hrs.
If it cost £10,000 for 40,000 kW Hr, then one kW Hr costs 25p
200,000 hrs = 22.8 YEARS (and rate of generation = 1,754 kW Hr. per year) .. and I'm amazed to discover that you can actually get such things with a 20 yr. guarantee on them (see link below) !
Just checked my last few bills = a quick calculation suggest I need to install about 8 - 10 panels to 'halve my energy costs' (see first link below) .. problem being (of course) I use most energy in Winter (when we get least sun :-) ) ..
I also note I pay approx 3p per kW Hr gas and 9p per kW Hr for electricity .. so an average of 6p per kW Hr ... I guess swapping to Solar is still a long way off being financialy viable :-)
What's perhaps more interesting, is a gas powered electricity generator would 'only' need to be approx 40% efficient for it to be worth while ... (unfortunatly even comnmercial plant finds it hard to exceed efficiencies of 28% :-) )
2007-06-26 08:51:57 · answer #3 · answered by Steve B 7 · 0⤊ 0⤋
0.25p
cost/life span
£10000/200000
£0.05 / hour of use
produces 0.2 / hr so x 5 = 1kw
0.05 x5 = £0.25
2007-06-25 04:41:28 · answer #4 · answered by benji 3 · 0⤊ 0⤋
AP Physics is tough. If your math grades are at least a B then I would consider taking AP Physics. It will be tough for you unless you are really strong in math.
2016-04-01 03:34:51 · answer #5 · answered by Anonymous · 0⤊ 0⤋
£10,000 divided by 200,000 hrs equals 5 pence per hour at 0.2kw usage
see how much kw usage you need to run whatever you need to run.....and divide it by 0,02 and then times it by £0.05 to give you your hourly £ consumption....???
2007-06-25 08:07:44 · answer #6 · answered by tim 5 · 0⤊ 0⤋
four lbs
2007-06-25 04:41:41 · answer #7 · answered by Anonymous · 0⤊ 3⤋