Energy Transfers

Question 1

internal energy

Answer 1

the energy stored in the movement of particles

Question 2

evaporation

Answer 2

it occurs on the surface of a liquid as it changes into the gas phase and is a way of transferring energy

Question 3

radiation

Answer 3

the emission or transmission of energy in the form of waves or particles through space or through a material medium

Question 4

conduction

Answer 4

the process by which heat energy is transmitted through collisions between neighbouring atoms

Question 5

convection

Answer 5

process by which heat is transferred by movement of a heated fluid

Question 6

efficiency of an appliance

Answer 6

the amount of useful energy compared with the total amount supplied

Question 7

payback time

Answer 7

how long it will take to save the money that an efficiency measure costs

Question 8

kilowatt-hour (kWh)

Answer 8

the amount of energy transferred in 1 hour by an applicants with a power of 1kW

Question 9

efficiency word equation

Answer 9

efficiency = useful energy transferred
—————————— x100
total energy supplied

Question 10

payback time equation

Answer 10

payback time =cost of change / saving per year