Energy Topic Flashcards
What unit is used to measure energy?
Joules (J)
Describe a hot object in terms of energy
Thermal Energy Store
Describe food, fuel and batteries in terms of energy
Chemical Energy Stores
How do you calculate energy efficiency?
Useful energy out / Total energy in
How to improve the efficiency of an energy transfer?
Reduce wasted or dissipated energy
What is the law of conservation of energy?
Energy can not be created or destroyed, only transferred
How is heat transferred into gas and liquids?
Convection
How is heat transferred into solids?
Conduction
What does low thermal conductivity mean?
The rate of thermal energy transfer is low
How can you reduce energy transfer through materials?
Increasing the thickness of the material
Gravitational potential energy formula?
GPE = m x g x h
Kinetic energy formula?
KE = 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 per unit area.
Explain why increasing temperature increases gas pressure
Heat energy is transferred to kinetic energy
the particles hit the walls more often and with more force.
