Electrons and electricity
Electricity consists of electric charge. Though electricity has been the subject of scientific investigations for thousands of years, the nature of electric charge is not fully understood, even at the present day. But we do know enough about it to be able to use it in many ways. Using electric charge is what this book is about.
Electric charge is a property of matter and, since matter consists of atoms, we need to look closely at atoms to find out more about electricity. But, even without studying atoms as such, we are easily able to discover some of the properties of electricity for ourselves.
The simplest way to demonstrate electric charge is to take a plastic ruler and rub it with a dry cloth. If you hold the ruler ...
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