Technical bits that may be useful
At the end of many of the chapters, there is a small quiz to allow us to try out our news kills. All the answers are given at the back of the book with full workings for calculations. It’s just a bit of fun – don’t take it seriously.
A small charge
We are used to buying fuel by the gallon or liter, and newspapers and books are sold ‘each’ but what about electricity?
The smallest quantity of electricity is a single electron but it would be difficult to sell electricity by the electron just as it would not be practical to sell rice by the grain. The unit we use is about 6.25 million million million electrons and we call this a ‘coulomb’ of electricity. When we create static electricity by rubbing a balloon ...
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