Energy Flashcards
1
Q
What is internal energy
A
the total kinetic and potential energy of all the particles in a system
2
Q
if the temperature in an energy store increases, what does the increase depend on
A
- the mass of the substance heated
- what the substance is
- the energy input
3
Q
What is specific heat capacity
A
the amount of energy required to raise the temperature of one kilogram of he substance by one degree
4
Q
What happens to the energy when a lift raises the lift carriage
A
- it transfers electrical energy to gravitational energy
- some energy is dissipated into the surroundings as heat and sound
- this wasted energy is no longer available for useful transfer
5
Q
how can wasteful energy caused by unwanted transfer be reduced
A
- lubrication reduces friction that produces heat
- tightening any loose parts prevents any unwanted vibrations wasted as sound energy
- thermal insulation
6
Q
what does the rate of cooling in a building depend on
A
the thickness and thermal conductivity of the walls
7
Q
name 3 renewable sources of energy
A
solar, wind, biofuel, geothermal, hydro-electric
8
Q
name 3 non-renewable sources of energy
A
nuclear fuel, coal, oil, gas
