Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
4 Cards in this Set
- Front
- Back
Equation for efficiency
|
efficiency=useful energy transferred/total energy supplied
Efficiency can be given in joules or kilojoules, or as a percentage (how much useful energy is transferred). |
|
Sankey diagrams
|
These show the efficiency of an appliance - they are a visual representation of how much energy is put into the appliance, how much is wasted and how much is actually put to use.
|
|
Efficiency
|
This term refers to how good an appliance is at using energy for what we want it to - this is considered useful energy. For example, a light bulb transfers some energy into light, and some into heat. We only consider the light energy to be useful in this case.
|
|
Efficiency ratings
|
All electrical appliances must now have an energy efficiency label. The label shows how much energy you would expect to use in a year. It also grades the appliance in one of seven categories, from A to G.
|