Efficiency of machines Flashcards
Why are useful devices useful
because they can transform energy from one form to another
What is most of the “lost” or “wasted” energy
Heat energy
The less energy that is wasted…
…the most efficient something is
Why is “wasted” energy called “wasted energy”
because you cannot do anything useful with it
What type of energy is useful energy
Concentrated
When does energy become less concentrated/dissipate
When it is transferred to cooler surroundings
How much more efficient is a low-energy lightbulb compared to a normal light bulb
4 times
What are more expensive; energy efficient bubs/normal bulbs
Energy efficient bulbs
What last longer; energy efficient bulbs/normal bulbs
Energy efficient bulbs
/what are more cost effective; energy efficient bulbs/normal bulbs
Energy efficient bulbs
What are more efficient;energy efficient bulbs/LED bulbs
LED bulbs
What do heat exchangers do
reduce the amount of heat energy that is ‘lost’
How do heat exchangers work
- They pump a cold fluid through the escaping heat
- The temperature of this fluid rises as it gains heat energy
- The heat energy in the fluid can be converted unto a form of energy that is useful again
