Magnetism and Electricity What you may already know:
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Many things run on electricity: home appliances, the internet, mobile phones, satellites and even some cars.
z Switches can be used to turn things on and off. z Batteries can be used to power different devices. z Magnets can attract or repel each other.
What you will learn in this chapter:
z How magnets work and uses of magnets. z What static electricity is and its effects. z
The components of an electric circuit and different ways to wire a circuit.
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What is meant by current, potential difference and resistance.
z How electricity is supplied to homes. z z
How do smartphones, touchscreens, Wii controllers and computers work?
How do we know which way is north and which way is south?
Can you crack this code? The first letter of each image spells out a key word that you will come across in this chapter. Use the hints provided if you need to, or revisit the Puzzler after you finish this chapter. 1.
