Efficiency Flashcards
1
Q
what is efficiency
A
a measure of how much of the input energy appears as useful output energy.
2
Q
how does efficiency link to wasted energy
A
the more energy wasted, the less efficient the device is, and vice versa
3
Q
efficiency formula
A
useful output energy transfer/ total input energy transfer
4
Q
can any device be 100% efficient
A
NO , except electric heaters, all the energy in the electrostatic energy store is transferred to the useful thermal energy store
5
Q
ways to increase the
efficiency of an intended energy transfer.
A
- insulating the object
- lubricating the object
- making the object more streamlines
