KNOWLEDGE FOCUS Topic


Electrical systems


and control (Grade 9


Electronics) Grade 7 (Term 3)


Electrical circuit basics: • Basic circuit components: cell(s), conductor, switch, resistor, lamp


• Simple circuit diagrams: showing various component arrangements


Magnetism and magnetic metals: iron


and steel, nickel, cobalt •


• Recycling metals


Introduction to electromagnetism: the electromagnet


Grade 8 (Term 4)


Electrical circuit basics: • Circuit diagrams, conventions and component symbols


• Input-, control- and output devices • Circuit design (simple) and circuit interpretation


• Circuits with more than one input or control device


Electrical energy sources (including


illegal connections): • Sources of direct current: electrochemical and photovoltaic cells


• Sources of alternating current: generating (thermal and alternate)


• Distributing AC electricity: the national grid, transformers


Ohm’s Law: qualitative treatment


Logic conditions: • AND logic (series); truth table • OR logic (parallel); truth table


Task: design and make a crane to carry an electromagnet to sort metals for recycling


Task: dual switch system like an alarm circuit with at least two panic buttons in different rooms, or similar concept using either AND or OR logic conditions


13


Task: identify a problem that can be solved by an electronic circuit. Assemble a given electronic circuit and design a device which can utilise the circuit to solve the problem.


input. •


Grade 9 (Term 3)


Electronic systems and control: how simple electronic circuits and devices are used to make an output respond to an


Input components: electrochemical cells, photovoltaic cells


• Storage components: electrochemical cells, capacitors.


• Control components: switches, resistors, diodes, light- emitting diodes (LED), transistors


• Sensor components: thermistors, light- dependent resistors (LDR)


• Output components: lamp, buzzer/bell, light- emitting diodes (LED)


• Resistor codes


Ohm’s Law: quantitative treatment with graphs and calculations


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