Term 3 Topic 5 Mechanical systems and control ......................................................... 99


Unit 1 Revise levers and gears.....................................................................................................100 Unit 2 Mechanical advantage calculations.................................................................................108 Unit 3 Representing gears graphically ........................................................................................113 Unit 4 Investigation skills ...........................................................................................................119 Topic 5 Summary ........................................................................................................................123


Practical Assessment Task (PAT): Tendering for contracts ..........................................................124 Term 3 Exemplar test ..................................................................................................................129


Term 4 Topic 6 Electrical systems and control .......................................................... 131


Unit 1 Simple electrical circuits ..................................................................................................132 Unit 2 Using energy ....................................................................................................................136 Unit 3 Electrochemical and photovoltaic cells...........................................................................141 Unit 4 Generating electricity ......................................................................................................144 Topic 6 Summary .........................................................................................................................149


Practical Assessment Task (PAT): Electrical safety systems: Panic buttons..................................150 Term 4 Exemplar exam ...............................................................................................................154


Electrical component symbols.......................................................................................156 Tools for Technology ....................................................................................................158 Glossed index ..............................................................................................................166 Acknowledgements ......................................................................................................168


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