TERM 4 Unit 1 Topic 6: Mechanical systems and control
• Revise: simple circuit components; input devices (electrochemical cell; generator; solar panel), output devices (resistor; lamp; heater; buzzer; motor); control device (switches). Note: Some devices can serve as input, output, process or control device.
• Correct connections, short circuits. Electrical components and their accepted symbols. • Drawing electrical circuits using accepted symbols (as in Grade 12 see Addendum C). • Set up circuits using a range of components. Draw the circuits using symbols.
2
• Energy for heating, lighting and cooking in rural and informal settlements. • Energy from illegal connections; ethical issues; safety considerations. • Class discussion: equitable sharing of resources – industry needs reliable power for job creation; schools need power for lighting and computing.
• Written report: Learners write a balanced report on these issues. 3
• Electrochemical cells. • Practical: make your own batteries – fruit, vegetable and salt water batteries. • Advantages and disadvantages of series and parallel batteries. • Photovoltaic cells - advantages and disadvantages of solar cells.
4
Generate electricity for the nation – advantages and disadvantages of: • Thermal power stations (steam turbines – sources of heat: coal, gas, nuclear, sun). • Hydroelectric power stations (including pumped storage schemes). • Wind-driven turbines.
Alternating current; step-up and step down transformers; distributing electric power across the country: the national grid.
141–143 2 136–140 2
Learner’s Book page
132–135 Time
allocation (2 hours)
2
144–148
2
22
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