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9.1  Energy, Technology and Waves



INTRODUCTION

Our world has been radically changed by the discovery and technological application of electricity.  The discovery of electricity and how to use it has began the technology revolution when ways of using electricity to send messages were worked out.   At first the messages were carried through wires then electromagnetic radiation was discovered.   Electromagnetic radiation allows messages to be sent “wireless”.   Later, people figured out how to send and store information digitally - computers were invented. 

In this topic we investigate how electric circuits are built, how waves can be used to carry energy and information and about light and microwaves as examples of electromagnetic radiation.


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