By John Bird
During this booklet John chicken introduces electric rules and expertise via examples instead of conception - allowing scholars to advance a valid knowing of the foundations wanted by means of technicians in fields akin to electric engineering, electronics and telecommunications. No past history in engineering is thought, making this an incredible textual content for vocational classes at point 2 and three, starting place measure and introductory classes for undergraduates.
The publication offers a logical subject development instead of following the constitution of a selected syllabus. besides the fact that, the insurance of this new version has been introduced absolutely in keeping with and electronics devices of the 2007 BTEC nationwide specification. it's also designed to hide the necessities of the BTEC First specifications.
New fabric during this 3rd variation comprises fresh chapters on semiconductor diodes and transistors in addition to further sections on batteries, gas cells and replacement and renewable energies, relative and absolute voltages, self and mutual inductance, and digital attempt and measuring instruments.
Support fabric for tutors is out there as a unfastened obtain through the trainer guide part on http://textbooks.elsevier.com:
Instructor's guide with complete recommendations and instructed marking scheme for all 7 revision exams within the book
Solutions handbook with labored options for roughly four hundred of the extra difficulties within the book
Electronic documents for all illustrations within the book
* New color format is helping navigation and highlights key studying issues, formulae and exercises
* four hundred labored difficulties and over 1,300 questions, all with answers
* totally brand new with the 2007 BTEC nationwide specification
* loose lecturer aid fabric to be had through textbooks.elsevier.com
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Extra info for Electrical and Electronic Principles and Technology (3rd Edition)
5 to 2 times wider than the other bands) Problem 14. Determine the value and tolerance of a resistor having a colour coding of: orange-orange-silver-brown. e. 1. e. 1. 33 with a tolerance of ±1% Problem 15. Determine the value and tolerance of a resistor having a colour coding of: brown-black-brown. e. 1. 1, the tolerance is ±20%. Hence a colour coding of brown-black-brown represents a resistor of value 100 with a tolerance of ±20% Problem 16. Between what two values should a resistor with colour coding brown-black-brown-silver lie?
Determine (a) the current flowing in the bulb, and (b) the resistance of the bulb. 4 A 250 25 5 (b) Resistance R = Power P = I R = (4 × 10 Power dissipated by coil, P = I 2 R = 52 × 100 Problem 13. The hot resistance of a 240 V filament lamp is 960 . Find the current taken by the lamp and its power rating. 5 kW P V Problem 10. Calculate the power dissipated when a current of 4 mA flows through a resistance of 5k . 25 A = 96 4 current I = Power rating P = VI = (240) 1 4 = 60 W Section 1 An introduction to electric circuits 15 Section 1 16 Electrical and Electronic Principles and Technology Electrical energy Electrical energy = power × time If the power is measured in watts and the time in seconds then the unit of energy is watt-seconds or joules.
E. R ∝ l. Hence, 600 ∝ 5 m or 600 = (k)(5), where k is the coefficient of proportionality. 5 m k 120 Problem 2. A piece of wire of cross-sectional area 2 mm2 has a resistance of 300 . Find (a) the resistance of a wire of the same length and material if the cross-sectional area is 5 mm2 , (b) the cross-sectional area of a wire of the same length and material of resistance 750 . e. e. 03 × 2000 100 Problem 5. 25 . 02 × 10−6 m. 03 × 10−6 m. 06 Problem 4. Calculate the resistance of a 2 km length of aluminium overhead power cable if the cross-sectional area of the cable is 100 mm2 .