P1.2 Flashcards
An appliances efficiency…
…helps to compare the cost-effective
What does payback time equal?
Initial cost/annual saving
What are the most effective methods of insulation?
The ones that give the biggest annual saving
Eventually money you save equals…
…the initial cost of insulation know as payback time
The most cost-effective methods…
…are the cheapest
Why are methods of insulation cost effective?
Because they have a short payback time
Energy can be…
…transferred usefully, stored or dissipated (spread out and lost)
Energy can never…
…be created or destroyed
Energy is either transferred…
…usefully or wasted
Where is wasted energy eventually transferred?
To the surroundings which become warmer
Wasted energy becomes…
…increasingly spread out and becomes less useful
Efficiency=
Useful energy out/total energy in x100
Name the 10 different types of energy
Most - magnetic Kids - kinetic Hate - heat/thermal Learning - light Gcse - gravitational potential, chemical, sound, electrical Energy - elastic potential Names - nuclear
What does an appliances efficiency tell us?
How much energy is transferred as useful energy and used
