P1.2 Energy and Efficiency NOT FINISHED Flashcards
Where is electrical energy found?
Whenever a current flows
Where does light energy come from?
From the Sun, light bulbs, etc
Where does sound energy come from?
From loudspeakers, or anything noisy
Where is kinetic energy found?
Anything that is moving, has it
Where does nuclear energy come from?
It is released from nuclear reactions
Where is thermal (heat) energy found?
It flows from hot objects to colder ones
Where is gravitational potential energy found?
In anything which can fall
Where is elastic potential energy found?
Stretched springs, elastic, rubber bands, etc
Where is chemical energy found?
Food, fuels, batteries, etc
What are gravitational P’, elastic P’ and chemical energy all forms of?
Stored energy, the energy is not doing anything but it is waited to be turned into other forms
What is the conservation of energy principle?
Energy can be transferred usefully from one form to another, sored or dissipated - but it can never be created or destroyed
What is the energy supplied to a device called?
The energy input
What is the useful energy transferred by a device called?
The energy output
What determines the efficiency of a device?
The less energy that is wasted, the more efficient that device is
What is the formula for finding efficiency in terms of energy?
Efficiency = useful energy out / total energy in
