Summary
Contents
Subject index
Are you looking for ideas to make your science teaching come alive? Full of suggestions for exciting and practical activities to engage children, Practical Science 11-16 explains the science behind the experiments and shows you where it links to the national curricula in England, Scotland, Wales and Northern Ireland. The book covers the three sciences: chemistry, biology and physics. It contains detailed subject knowledge to ensure you grasp key concepts, and there are lots of useful diagrams to help illustrate key points.Experiments include:extracting DNA from a kiwi fruitcapturing rainbowsthe chromatography of sweetsremoving iron from cornflakesa plate tectonic jigsaw
Electric Motors
Electric Motors
This Chapter Covers:
- the magnetic fields around electrical wires
- Maxwell's Screw Rule
- Fleming's Left Hand Rule
- using currents and magnetic fields to create motion
- the construction of simple electrical motors.
Test Your Own Knowledge
Before reading the material in this chapter test your current knowledge with
the following questions:
- Although we cannot see the field lines around a magnet, we can detect them using a plotting compass (see Figure 8.1). Where around a magnet are field lines most concentrated?
- Do field lines point from North to South or South to North?
- A magnetic field is produced when an electric current flows through a coil of wire. What will happen to an electromagnet when a) the current is switched off; b) the current is reversed?
- True or false? The following steps ...
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