Overview of P3.7 What is the process inside an electric generator? Lesson Statements Teaching activities Notes 1 (1hr P3.7.1 recall that a change in the magnetic field Engage: How do microphones work? Link to delivery guide Electric circuits separate around a conductor can give rise to an induced A short video explaining how different kinds of microphones work. science potential difference across its ends, which could only) drive a current Explore: Generator: Generator, magnetism, magnetic field P3.7.2 explain the action of a moving coil An interactive Java application featuring a virtual magnet, electromagnet, microphone in converting the pressure transformer and generator. variations in sound waves into variations in current in electrical circuits microphone demo Explain: Extend: Guitar pickup A simple demonstration of the principles by which electric guitar pickups work. Evaluate: compare loudspeakers to microphones get pupils to discuss how the – two work, hopefully they will come up with the idea that microphones are loud speakers in reverse. 2 (1hr P3.7.3 recall that the direction of the induced Engage: explanation of generators Link to delivery guide Electric circuits separate potential difference drives a current which Explore: Generator: AC science generates a second magnetic field that would A simple Java application showing an AC generator. only) oppose the original change in field P3.7.4 use ideas about electromagnetic Explain: Generation of alternating current induction to explain a potential difference / time graph showing the output from an alternator A presentation explaining AC generation. being used to generate a.c. P3.7.5 explain how an alternator can be adapted Extend: Generator: DC to produce a dynamo to generate d.c., including A simple Java application showing a DC generator. explaining a potential difference time graph Potential difference- time graphs pupils explain the graphs for a.c. and Evaluate: d.c.
Overview of P3.7 What is the process inside an electric generator? Lesson Statements Teaching activities Notes 1 (1hr separate science only) P3.7.1 recall that a change in the magnetic field around a conductor can give rise to an induced potential difference across its ends, which could drive a current P3.7.2 explain the action of a moving coil microphone in converting the pressure variations in sound waves into variations in current in electrical circuits Engage: How do microphones work? A short video explaining how different kinds of microphones work. Explore: Generator: Generator, magnetism, magnetic field An interactive Java application featuring a virtual magnet, electromagnet, transformer and generator. Explain: microphone demo Extend: Guitar pickup A simple demonstration of the principles by which electric guitar pickups work. Evaluate: compare loudspeakers to microphones – get pupils to discuss how the two work, hopefully they will come up with the idea that microphones are loud speakers in reverse. Link to delivery guide Electric circuits 2 (1hr separate science only) P3.7.3 recall that the direction of the induced potential difference drives a current which generates a second magnetic field that would oppose the original change in field P3.7.4 use ideas about electromagnetic induction to explain a potential difference / time graph showing the output from an alternator being used to generate a.c. P3.7.5 explain how an alternator can be adapted to produce a dynamo to generate d.c., including explaining a potential difference time graph Engage: explanation of generators Explore: Generator: AC A simple Java application showing an AC generator. Explain: Generation of alternating current A presentation explaining AC generation. Extend: Generator: DC A simple Java application showing a DC generator. Evaluate: Potential difference- time graphs pupils explain the graphs for a.c. and d.c. Link to delivery guide Electric circuits
309134-chapter-p3-suggested-teaching-hours-and-outline-scheme-of-work.docx