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Electric power
Resources, Classroom Activities, Assessment Ideas, IT Applications
Resources
Text Resources
- VCE Physics: Electric Power, 1994, 2nd edn, National Electricity.
Audiovisual Resources
It is recommended that teachers should view any video before purchase.
- Marcom Projects: Electrical Principles , Electricity Distribution, Electromagnetic Induction, Electromagnetism 1, 2, Magnets & Electricity, Electrical Components 3
Classroom Activities
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Describes the magnetic force on moving charges and goes on to look at the effect of the Earth's magnetic field on charges from the Sun and at the Hall effect, which gives us insight into the nature of electric currents as well as many practical applications. | |||
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Describes Maxwell's equations and Electromagnetic Waves. The material is beyond the curriculum, but would be of interest to students looking for a little extra in this area. | |||
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From John Joosten. When you roll a NIB magnet down an Aluminium sheet it curves to one side. The curving appears to depend on the orientation of the sheet in the Earth's magnetic field. How can it be explained. Share you ideas in the Physics "Forum". | |||
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38.4 kB | ||
When you roll a NIB magnet down an Aluminium sheet it curves to one side. The curving appears to depend on the orientation of the sheet in the Earth's magnetic field. An explanation. | |||
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When you roll a NIB magnet down an Aluminium sheet it curves to one side. The curving appears to depend on the orientation of the sheet in the Earth's magnetic field. An application: a NIB homopolar electric motor | |||
Assessment Ideas
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28.2 kB | ||
From the previous course on a generating system. | |||
IT Applications
Useful Websites
A very comprehensive website on motors, generators and transformers
A very comprehensive website on motors, generators and transformers featuring many effective animations.
Electrical Engineering: Global History Network
The IEEE Global History Network is a wiki-based platform dedicated to preserving and promoting the history of innovation in the fields of electrical engineering and its allied fields. There is considerable educational material but much is related to history, but the site is very comprehensive.
Applets
The Lorentz Force (F=BIl)
The applet by walter fendt shows a U shaped wire in the magnetic field of a horseshoe magnet. You are able to turn on a current and see the wire move. You can reverse the magnet and the direction of the current. The display shows the direction of the current, the magnetic field and the force.
Direct Current Electric Motor
Applet by Walter Fendt. The display shows a coil rotating slowly in magnetic field. The coil is linked to a battery through a commutator. You can reverse the direction of the current and increase the speed of rotation, you also can decide to show the directions of the magnetic field, the current and the direction of the magnetic force called the Lorentz force.
The Generator
Applet by Walter Fendt. The display shows a coil rotating slowly in a magnetic field. The current in the coil is shown by arrows which change direction as the coil rotates, the loop can be connected through either slip rings or a commutator through a resistor with a voltmeter across it. The needle of the voltmeter moves backwards and forwards. You can vary the rotational speed and select either slip rings or commutator, you also can decide to show the directions of the magnetic field, the direction of movement of the wire, and the induced current. Increasing the rotation, increases the peak voltage.
Electromagnetic wave
The applet by Walter fendt shows oscillating electric and magnetic fields at right angles to the direction of propagation. There is nothing to vary.