Units_and_constants - Prefix exa peta tera giga mega kilo...

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Prefix Abbreviation Magnitude Derivation exa E 10 18 Greek ex , “beyond” peta P 10 15 Greek petasos , “outreach” tera T 10 12 Greek teras , “monster” giga G 10 9 Latin gigas , “giant” mega M 10 6 Greek megas , “great” kilo k 10 3 Greek chilioi , “a thousand” milli m 10 -3 Latin mille , “a thousand” micro μ 10 -6 Greek mikros , “small” nano n 10 -9 Greek nanos , “dwarf” pico p 10 -12 Spanish pico , “small quantity” femto f 10 -15 Danish femten , “fifteen” atto a 10 -18 Danish atten , “eighteen” Fundamental Units Name of dimension or quantity Symbol Description SI unit and abbreviation Equivalent units Dimension Current I time charge ampere (A) 6.25×10 18 electron charges per second = s C I Length L, l meter (m) 1,000 mm = 100 cm L Mass M, m kilogram (kg) 1,000 g M Time T, t second (s) 60 1 min = 600 , 3 1 hr = 400 , 86 1 day T Mechanical units Name of dimension or quantity Symbol Description SI unit and abbreviation Equivalent units Dimension Acceleration a 2 time length time velocity = 2 second meter kg N 2 T L Area A, a, s length 2 meter 2 (m 2 ) L 2 Energy or work W force × length = power × time joule (J) N m = W s = V C = 10 7 ergs = 10 8 dynes mm 2 2 T ML Energy density w volume energy 3 meter joule (J m -3 ) 3 100 1 mm erg 2 LT M
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Force F mass × acceleration Newton (N) m J s m kg 2 = = 10 5 dynes 2 T ML Frequency f time cycles hertz (Hz) s cycles T 1 Impedance Z velocity mass force × meter - kilogram second - newton m kg s N T 1 Length L , l meter (m) 1,000 mm = 100 cm L Mass M , m kilogram (kg) 1,000 g M Moment (torque) force × length Newton-meter (N m) J s m kg 2 2 = 2 2 T ML Momentum m v mass × velocity = force × time = velocity energy Newton-second (N s) m s J s m kg = T ML Period T frequency 1 second (s) T Power P time length force × time energy = watt (W) s m N s J = 3 2 s m kg = 3 2 T ML Time T , t second (s) 60 1 min = 600 , 3 1 hr = 400 , 86 1 day T Velocity
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This note was uploaded on 11/04/2009 for the course ECE ece 201 taught by Professor Timhogan during the Spring '09 term at Michigan State University.

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Units_and_constants - Prefix exa peta tera giga mega kilo...

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