Fundamental Electrical and Electronic Principles, Third Edition

Fundamentals 29approved graph paper. Simple lined or squared paperis NOT adequate. Try to use as much of the page aspossible, but at the same time choose sensible scales.For example let the graduations on the graph paperrepresent increments such as 0.1, 0.2, 0.5, 10 000, etc.and not 0.3, 0.4, 0.6, 0.7, 0.8, 0.9 etc. By doing this youwill make it much simpler to plot the graph in the firstplace, and more importantly, very much easier to takereadings from it subsequently.Conclusions: Having gone through the above procedure you need tocomplete the assignment by drawing some conclusionsbased on all the data gathered. Any such conclusionsmust be justified. For example, you may have takenmeasurements of some variable y for correspondingvalues of a second variable x. If your plotted graphhappens to be a straight line that passes through theorigin then your conclusion would be as follows:‘ Since the graph of y versus x is a straight line passingthrough the origin then it can be concluded that y isdirectly proportional to x ’ .Summary of EquationsCharge: Q It coulombOhm ’ s law: V IR voltTerminal p.d.: V E Ir voltEnergy: W VIt I 2 Rt V 2tRjoulePower: P W t VI I 2 R V 2wattRResistance: R ρ A ohmResistance at specified temp.: R 1 R 0 (1αu) ohmor R R121 1 αθ1αθ2