Efficiency

Question 1

What is efficiency ?

Answer 1

useful devices are only useful because they transfer energy from one store to another. Input energy is usually wasted by being transferred to useless store - usually Thermal energy store

Less energy wasted in this energy store = the more efficient the device is said to be.
Efficiency is a measure of how much useful energy output you get from a system compared to the total energy input.

Question 2

You can improve efficiency of energy transfer by

Answer 2

insulating objects, lubricating objects or making them more streamlined

Question 3

Efficiency calculations

Answer 3

useful power output / total power input

Useful output energy transfer / total input energy transfer

Question 4

are all object 100% efficient ?
exception include ..

Answer 4

No, useless energy is usually dissipated to useless store such as TES.

Except electric heaters = 100% efficient as all energy in electrostatic energy store is transferred to “useful” TES.

Question 5

Ultimately all objects energy transfer to what store ?

Answer 5

TES