energy key questions I struggled on

Question 1

State why energy transfer is equivalent to work done

Answer 1

Because work must be done to transfer energy from one store to another

Question 2

What is an elastic object?

Answer 2

one that returns to its original shape and size when a force has been removed

Question 3

What is the equation linking elastic potential energy, spring constant and extension

Answer 3

elastic potential energy = 0.5 x spring constant x extension2

Question 4

State when energy is stored in a chemical energy store

Answer 4

Energy is stored in chemical bonds

Question 5

Name the process that allows heat to transfer via waves

Answer 5

infrared radiation

Question 6

Define ‘power rating’

Answer 6

the rate at which an electrical device can transfer 1J of energy each second

Question 7

Which insulation method can be used to reduce heat loss through gaps in doors?

Answer 7

draught excluders

Question 8

What does the thermal conductivity of a material tell us?

Answer 8

the rate of energy transfer by conduction

Question 9

Name 7 renewable energy sources

Answer 9

biofuel, wind, hydro-electricity, geothermal, tides, sun, water waves