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Unformatted text preview: Cairo University Electronics and Communications Engineering Technical English, Lecture 6: Technical writing Hossam A. H. Fahmy c 2007 2 Numbers Numbers are important in technical documents. • Be accurate. – “The forward bias voltage of a diode is small .” (How small is small? Should it be the voltage across the diode?) – “Digital disks are better than the analog ones.” (In what? By how much?) • Compare the same dimensions. “The value of R is twice that of C.” • Use a small space to separate groups of three digits in a number: 123 456 and not a comma 123 , 456. (Note the difference between 123 , 456 and 123 , 456. The latter is two numbers separated by a comma.) • Insert a ‘0’ before the fractional point for numbers between 1 and 1: 0 . 53 not . 53. 3 Objects, properties, and values Watch out for the difference between a resistor and a resistance, a capacitor and a capacitance. A resistor is soldered, a resistance is measured, and the value of the resistance is 470 ohms. 4 Additions Parallel work adds in one sense but not the other. Two students working together on a project for a week • produce more work than another student working alone for the same week, but • each gets a work experience of one week not two! 5 Zero and infinity In calculations, engineers often neglect some terms if they are much smaller than other terms. These are “zeros” while very large terms are “infinities”. • Remember that in reality these are not the mathematical zero or infinity. • In a lab measurement or in a simulation, you will never have a zero or infinity....
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This note was uploaded on 04/09/2010 for the course ELECT. ENG 607 taught by Professor Hossamfahmy during the Spring '09 term at Cairo University.
 Spring '09
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