P1.2 Flashcards
1
Q
Where is wasted energy transferred to?
A
The surroundings
2
Q
What happens to the wasted energy?
A
It spreads out and so becomes less useful.
3
Q
What happens to the surroundings when wasted energy escapes?
A
They get warmer
4
Q
Give the formula for calculating efficiency if energy as a percentage
A
Efficiency= useful energy
–-—————- x100
Total energy
4
Q
What is payback time?
A
The time taken for the money invested to be regained
5
Q
How is payback time worked out?
A
payback time (years) = cost of installation ÷ savings per year
