P1: Energy Flashcards
List some of the types of energy stores.
Kinetic, chemical, electrostatic, elastic potential, gravitational potential, nuclear, magnetic, thermal.
What does “doing work” mean?
Energy is being transferred
What is dissipation?
A term to describe ways in which energy is wasted.
What means energy is wasted?
If it is not usefully transferred
What are the three things that energy can do?
Be transferred usefully, stored or dissipated.
What are the two things that energy cannot do?
Be created or destroyed.
What are the two things that the amount of work done when a force acts on a body depends on?
-The size of the force acting on the object,
-The distance through which the force causes the body to move in the direction of the force.
What is the equation for work done?
Work done = force x distance
What is efficiency?
How good a device is at transferring energy input into useful energy output.
What is the highest possible efficiency something can have?
99.9999999…%
What is a conductor?
A material that allows internal energy to be transmitted through it easily.
What makes metal a good conductor?
Ions in the solid metal are close together.
Increase in temperature causes an increased vibration, meaning the ions collide with neighbours more frequently.
Energy is passed on by these collisions, transferring it.
More frequent collisions increase the rate of transfer.
What is an insulator?
A material that will not allow the easy flow of energy.
What is specific heat capacity?
The amount of energy is takes to raise the temperature of 1kg of something by 1°C
What is the name for systems that can store large amount of energy?
Energy resources.
