Free Downloads

Simple alkane cracking
This animation shows alkane cracking. It is an addition to Chemistry Animations.
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d.c. motor
This animation shows a model electric motor with graphics which are about as clear as we can get them. It is ideal for illustrating the direction of current, magnetic field and forces.
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Chemistry Animations
These three animations are samples from the newly released Chemistry Animations.
1. Distillation
2. Addition Polymerisation
3. Alkanes
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Geostationary satellites

This animation shows two views of a satellite in equatorial orbit. The height of the satellite can be adjusted and the time for one orbit displayed. Adjust the height to make the time for one orbit equal 24 hours. This is best checked using the view from above the north pole.
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Colour mixing

Two simple demonstrations of colour mixing of light.
One lets you click and drag the primary colour circles and view the colour in the overlap area.
The other allows the intensity of primary colours to be varied now you can explain how to produce orange!

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am and fm modulation

Two files are provided. One illustrates am modulation and the second illustrates fm modulation. In each case, the frequencies of the carrier wave and audio wave can be varied. The modulated wave can be viewed.
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  Diffraction of radio waves

This animation shows a radio transmitter and a house behind a hill. Change the frequency of the radio wave and observe the diffraction of the radio waves.

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Electrons in circuits

This animation shows electrons moving in a simple circuit consisting of a cell and two lamps. Each electron has an energy meter which shows how energy is used as the electrons move around the circuit.

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