By Edward Hughes; John Hiley, Keith Brown, Ian McKenzie Smith
During this textbook, the elemental ideas of electric know-how are in actual fact and easily defined after which used to introduce the appliance of electric and digital platforms. strength structures also are mentioned absolutely. This 10th version has been commonly up to date with all new advances within the box
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Extra info for Hughes Electrical & Electronic Technology, 10th Edition
8 Temperature rise 56 Summary of important formulae 57 Terms and concepts 58 Life is rarely simple, and so it is with electrical technology. Our simple circuit with a single source and a single load seldom exists except in battery torches. It follows that we should look to systems with an increased number of loads. This does not require a huge increase – it is generally sufficient to be able to handle two or three loads at a time but this will let us appreciate the problems encountered in practice.
Usually such variable resistors have three connections, being each end of the coil plus the connection from the wiper arm. When all three connections are used, the device is said to be a potentiometer, as shown in Fig. 11(a). In some instances, fixed connections are made to the wire so that we know the resistance offered between any two terminals. Such intermediate connections are known as tappings. A typical tapped resistor, still often referred to by its old name – the rheostat – is shown in Fig.
In this way, the electricity is brought to our industries and to our homes. e. to make them portable. In such cases, we use batteries. Batteries can be used for torches, transistor radios, hearing aids, cameras, watches and cars. In most of these examples we use a form of battery that provides an amount of energy after which the battery is thrown away. Such batteries are called primary cells. As a method of purchasing energy, they are extremely expensive, but we are prepared to pay the appropriate costs for the sake of convenience.