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Flashcards in Energy Deck (8)
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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