# Physics

#1
Need help with this question, why? because a wasp was flying around and i got too scared to concentrate... MUCH APPRECIATED FOR HELP

1. A new house is fitted with all the latest energy efficiency measures. An energy surveyor checks a new house and finds that each second a house is losing 125W of heat through it’s roof. The heaters in the house are producing around 800W of heat. How efficient are energy efficient measures?
0
5 years ago
#2
Key word there is "was" so now it's gone. You may concentrate. Good luck.
1
5 years ago
#3
As in, a percentage?

Posted from TSR Mobile
0
5 years ago
#4
Dude you're like 50 times bigger than a wasp, why be scared of it?
0
5 years ago
#5
(Original post by Xander25)
Need help with this question, why? because a wasp was flying around and i got too scared to concentrate... MUCH APPRECIATED FOR HELP
1. A new house is fitted with all the latest energy efficiency measures. An energy surveyor checks a new house and finds that each second a house is losing 125W of heat through it’s roof. The heaters in the house are producing around 800W of heat. How efficient are energy efficient measures?
((EnergyInput - WastedEnergyOutput)/EnergyInput)*100
Might be wrong, haven't done efficiency in a while.
0
5 years ago
#6
(Original post by DarkEnergy)
((EnergyInput - WastedEnergyOutput)/EnergyInput)*100
Might be wrong, haven't done efficiency in a while.
1
5 years ago
#7
(Original post by Xander25)
Need help with this question, why? because a wasp was flying around and i got too scared to concentrate... MUCH APPRECIATED FOR HELP
1. A new house is fitted with all the latest energy efficiency measures. An energy surveyor checks a new house and finds that each second a house is losing 125W of heat through it’s roof. The heaters in the house are producing around 800W of heat. How efficient are energy efficient measures?
Forget that it is losing that much every second
Use this : (useful energy output/useful energy input) then multiply by 100
Apparently my year were the last to be provided with a formulae sheet in the exam so you'll have to learn all of them off by heart. This is quite easy so just get it in your head. Also notice I haven't given you the answer but I hope giving you the formula has cleared things up for you
0
5 years ago
#8
Good observation Just a bit rusty on the basics atm, efficiency was in AS but I've pretty much forgotten all of AS over the summer & the question seems a bit weirdly worded.
1
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

Yes (137)
66.83%
No (46)
22.44%
I didn't use it to prepare (22)
10.73%