Lesson 1 AC and cables/plugs
Aim: Use oscilloscope traces to compare direct and alternating potential differences.
10 min Starter: Introduction to AC and DC electricity/oscilloscopes.
20 min Main 1: Key points and text book questions.
Copy down key points about AC electricity and solve some oscilloscope problems plus text book questions on pg 249.
· Cell and batteries supply current that passes in one direction (direct current)
· An alternating current constantly changes direction. Mains electricity is an AC supply. In the UK it has a frequency of 50 cycles per second (50 Hz)
· UK mains supply is about 230 Volts.
· The live terminal of the mains supply alternates between positive and negative potential with respect to the neutral terminal (Higher tier)
· The neutral terminal stays at a potential close to zero with respect to the earth (Higher tier)
20 min Main 2: Cables and plugs
Draw a diagram of the correct structure for a cable and a plug using pg 250 to help. Text book questions on pg 251 for early finishers.
Aim: Use oscilloscope traces to compare direct and alternating potential differences.
10 min Starter: Introduction to AC and DC electricity/oscilloscopes.
20 min Main 1: Key points and text book questions.
Copy down key points about AC electricity and solve some oscilloscope problems plus text book questions on pg 249.
· Cell and batteries supply current that passes in one direction (direct current)
· An alternating current constantly changes direction. Mains electricity is an AC supply. In the UK it has a frequency of 50 cycles per second (50 Hz)
· UK mains supply is about 230 Volts.
· The live terminal of the mains supply alternates between positive and negative potential with respect to the neutral terminal (Higher tier)
· The neutral terminal stays at a potential close to zero with respect to the earth (Higher tier)
20 min Main 2: Cables and plugs
Draw a diagram of the correct structure for a cable and a plug using pg 250 to help. Text book questions on pg 251 for early finishers.
The image and text are from BBC Bytesize which is a very useful revision tool. The link to material covered in todays lesson can be found here. http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa/electricity/mainselectrev1.shtml
10 min Plenary: Exam style question
On plugs from the foundation paper January 2007
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