energy Flashcards
(15 cards)
What is the unit for energy?
Joules (J)
Name an energy pathway
Mechanically
electrically
by heating
by radiation (sound and light)
Name an energy store
Chemical
kinetic
gravitational potential
elastic potential
thermal
magnetic
electrostatic
nuclear
What is the principle of the conservation of energy?
Energy cannot be created or destroyed, only transferred from one store to another store
What is specific heat capacity?
The amount of energy needed to raise the temperature of 1kg of a substance by 1 degree
What is thermal conduction?
The transfer of heat by the vibration of particles transfer energy from their kinetic energy store to the kinetic energy stores of neighbouring particle.
What are materials that conduct heat quickly called?
Conductors
What are materials that do not conduct heat quickly called?
Insulators
Which state of matter is the best conductor?
Solids
because the atoms are packed closely together
Why are metals the best conductors?
They contain freely moving electrons which transfers the heat more rapidly
What is thermal convection?
The transfer of heat through fluids by the upwards movement of warmer, less dense regions of fluid
