energy Flashcards
what is the unit is used for energy
joules (J)
describe a hot object in terms of energy
thermal energy store
describe food, fuel and battery’s in terms of energy
chemical energy stores
how do you calculate energy efficiency
useful energy out
divided by
total energy in
how do you improve the efficiency of an energy transfer
reduce wasted energy
what is the law of conservation energy
energy cannot be created or destroyed only transferred
how is heat transferred in gases and liquids
convection
how is heat transferred into solids
conduction
what does low thermal conductivity mean
the rate of thermal energy is low
how can you reduce energy transfer through materials
increasing the thickness of the material
gravitational potential formula
m x g x triangle h
kinetic energy formula
0.5 mv2
describe the movement of particles in a gas
particles move in completely random directions, most of gas is empty space
define gas pressure
the force the gas particle exerts outwards outward per unit area
explain why increasing temperature increases gas pressure
heat energy is kinetic energy the particles hit the walls more often with more force
