John Whitfield – författare

This is the first of a two-volume work covering the electrical principles syllabuses of all of the major examining bodies including the City & Guilds of London Institute's electrical craft courses. It is also suitable for a wide range of other courses, including the first three years of the BTEC electrical series. Great care has been taken to ensure that the text fully covers the content of the syllabuses concerned, both as published and as interpreted by the examiners in the past.The book is well illustrated with almost 200 line diagrams and photographs. Theories are explained with the help of almost 100 worked examples, an important aid to understanding the practical applications, and there are more than 300 graded exercises for which numerical answers are provided as well as nearly 250 multiple choice questions with solutions. These features make the book ideal as a class text as well as being particularly suitable for private study. A complete list of symbols, abbreviations and units is included, along with eight tables of relevant data and introduction to SI units, this system being used throughout. Each chapter concludes with a summary of the formulas introduced in it.The book will also be useful to practicing technicians wishing to extend their grasp of electrical principles to meet the rapidly expanding requirements of the industry.

This is the second of a two-volume work covering the electrical principles syllabuses of all of the major examining bodies including the City & Guilds of London Institute's electrical craft courses. It is also suitable for a wide range of other courses, including the first three years of the BTEC electrical series. Great care has been taken to ensure that the text fully covers the content of the syllabuses concerned, both as published and as interpreted by the examiners in the past.The book is well illustrated with almost 200 line diagrams and photographs. Theories are explained with the help of almost 100 worked examples, an important aid to understanding the practical applications, and there are more than 300 graded exercises for which numerical answers are provided as well as nearly 250 multiple choice questions with solutions. These features make the book ideal as a class text as well as being particularly suitable for private study. A complete list of symbols, abbreviations and units is included, along with eight tables of relevant data and introduction to SI units, this system being used throughout. Each chapter concludes with a summary of the formulas introduced in it.The book will also be useful to practicing technicians wishing to extend their grasp of electrical principles to meet the rapidly expanding requirements of the industry.

Documenting the species that have emerged, disappeared and been reborn over the millennia since the Cambrian Explosion, Lost Animals is the story of life on Earth. Over 520 million years ago, all the major animal groups – molluscs, worms, crustaceans, vertebrates – appear in the fossil record in what is, geologically speaking, the blink of an eye. As well as the animals we're familiar with today, evolution also experimented with now-obsolete body forms. Once, the world was a blank slate, but as this slate filled up, some lines were erased while others carried on to this day. Beautifully illustrated with artist's interpretations, photographs of fossils and excavations and scientific drawings, Lost Animals brings back to life some of the most charismatic creatures to inhabit the planet, as well as those representing an important link or leap in evolutionary terms. Zoologist Dr John Whitfield discusses those species we have lost, are only just discovering and those thought extinct until rediscovered, and the attempts to conserve and resurrect others.

Whitfield's Electrical Craft Principles, 6th edition is the first of a two-volume work that covers the electrical principles syllabi for all major awarding bodies such as BTEC, and City and Guilds. The book is fully illustrated throughout with line diagrams, photographs and drawings. Worked examples are included to aid understanding of the theories and principles presented in its pages. Each chapter concludes with a summary of formulae, a set of written exercises and a multiple-choice test, which makes the book ideal for both classroom and private study.The book will also be useful for practicing electrical installers, engineers and technicians who wish to deepen their knowledge and prepare themselves for the demands of a rapidly developing industry.

Whitfield's Electrical Craft Principles, 6th edition is the second of a two-volume work that covers the electrical principles syllabi for all major awarding bodies such as BTEC, and City and Guilds. The book is fully illustrated throughout with line diagrams, photographs and drawings. Worked examples are included to aid understanding of the theories and principles presented in its pages. Each chapter concludes with a summary of formulae, a set of written exercises and a multiple-choice test, which makes the book ideal for both classroom and private study.The book will also be useful for practicing electrical installers, engineers and technicians who wish to deepen their knowledge and prepare themselves for the demands of a rapidly developing industry.