By John Bird BSc (Hons) CEng CMath CSci FIET MIEE FIIE FIMA FCollT
This publication is written for the 6,000 BTEC nationwide Engineering scholars who persist with pathway each one year. The direction has a new syllabus for 2010 and electric and digital ideas and know-how has been absolutely up-to-date to mirror those alterations. during this 4th variation, John poultry introduces electric ideas and know-how via examples instead of concept masking - allowing point 3 scholars to enhance a valid realizing of the rules wanted for careers in electric engineering, electronics and telecommunications. The booklet contains various labored difficulties, multiple-choice and short-answer questions, workouts and revision exams and is supported with loose on-line instructor's and options manuals. Matched to the newest 2010 BTEC Engineering syllabusStudent-friendly technique with various labored difficulties, multiple-choice and short-answer questions, routines and revision testsIn color and supported with loose on-line instructor's and strategies manuals
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Additional info for Electrical and Electronic Principles and Technology, Fourth Edition
What is corrosion? Name two effects of corrosion and state how they may be prevented A battery consists of: (a) a cell (b) a circuit (c) a generator (d) a number of cells 2. d. f. 5 V 3. f. 5 are connected in series. f. f. f. f. 1 4. f. f. f. f. 1 5. Which of the following statements is false? (a) A Leclanché cell is suitable for use in torches (b) A nickel–cadmium cell is an example of a primary cell 14. f. of a cell? f. of a cell be measured? 15. Define internal resistance 16. f. d. V volts is given by: V = .
Lechlanché cell A typical dry Lechlanché cell is shown in Fig. 6. f. 5 V when new, but this falls rapidly if in continuous use due to polarisation. The hydrogen film on the carbon electrode forms faster than can be dissipated by the depolariser. The Lechlanché cell is suitable only for intermittent use, applications including torches, transistor radios, bells, indicator circuits, gas lighters, controlling switch-gear, and so on. The cell is the most commonly used of primary cells, is cheap, requires little maintenance and has a shelf life of about 2 years.
Certain batteries contain substances which can be a hazard to humans, wildlife and the environment, as well a posing a fire risk. Other batteries can be recycled for their metal content. Waste batteries are a concentrated source of toxic heavy metals such as mercury, lead and cadmium. If batteries containing heavy metals are disposed of incorrectly, the metals can leach out and pollute the soil and groundwater, endangering humans and wildlife. e. a substance producing cancerous growth), can cause liver and lung disease.