Introduction to IGCSE Physics - Year 9 Section 4: Energy resources and energy transfer
a) Units
b) Energy transfer
c) Work and power
d) Energy resources and electricity generation

a. Units
4.1 use the following units: kilogram (kg), joule (J), metre (m), metre/second (m/s), metre/second2 (m/s2), netwon (N), second (s), watt (W)

b. Energy transfer
4.2 describe energy transfers involving the following forms of energy: thermal (heat), light, electrical, sound, kinetic, chemical, nuclear and potential (elastic and gravitational)
4.3 understand that energy is conserved
4.4 recall and use the relationship: efficiency = useful energy output / total energy input
4.5 describe a variety of everyday and scientific devices and situations, explaining the fate of the input energy in terms of the above relationship, including their representation by Sankey diagrams
4.6recall that energy transfer may take place by conduction, convection and radiation
4.7 describe the role of convection in everyday phenomena
4.8 describe how insulation is used to reduce energy transfers from buildings and the human body

c. Work and power
4.9 recall and use the relationship between work, force and distance moved in the direction of the force: work done = force x distance moved (W = F x d)
4.10 understand that work done is equal to energy transferred

d. Energy resources and electricity generation
4.16understand that energy transfers involved in generating electricity using:

wind
water
geothermal resources
solar heating systems
solar cells
fossil fuels
nuclear power

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