Efficiency

Question 1

what is efficiency

Answer 1

a measure of how much of the input energy appears as useful output energy.

Question 2

how does efficiency link to wasted energy

Answer 2

the more energy wasted, the less efficient the device is, and vice versa

Question 3

efficiency formula

Answer 3

useful output energy transfer/ total input energy transfer

Question 4

can any device be 100% efficient

Answer 4

NO , except electric heaters, all the energy in the electrostatic energy store is transferred to the useful thermal energy store

Question 5

ways to increase the
efficiency of an intended energy transfer.

Answer 5

• insulating the object
• lubricating the object
• making the object more streamlines