Engineer's Need for Understanding Units in Engineering Practice
Explore the importance of units in engineering, defining basic and derived units, and discussing various systems of units utilized by engineers in their work. Understand the engineer's essential connection to units for precise measurements and calculations.
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Presentation Transcript
Lecture 3 Basic SI Units & Symbols
What is the Difference Between a Scientist and an Engineer? Scientists: Discover the world that exists. Engineers: Create the world that never was.
Engineering technological, and mathematical knowledge to problems. uses scientific, solve practical
Engineers Can Do Anything Invent: Develop a new product, system, or process that has never existed before. Innovate: Improve an existing technological product, system, or method. Design Build Analyze Create Improve Orchestrate Evaluate Conceive
The Word Its Meaning Example A, V, W, , Dr., Asst., Prof., Symbol Abbreviation Acronym USA, FEM, SCR, Synonym Prefix mA, GHz Script Subscript ?1 ?2 Superscript Arial, Times New Roman Font ) ( comma , ) ( Semicolon : Period . ) ( Punctuation
We use the following prefixes: Pico (p): 10-12 Tera (T): 1012 Nano (n): 10-9 Giga (G) : 109 Micro ( ): 10-6 Mega (M): 106 Mille (m): 10-3 Kilo (k): 103
The Following List of The Greek Alphabet Will Be Used in Literature as Symbols for Variables of Engineering Science The Studied Electrical The
No. 1 2 3 4 5 6 7 8 9 10 11 12 Capital B Small Name alpha beta gamma delta epsilon zeta eta theta iota kappa lambda mu
No. 13 14 15 16 17 18 19 20 21 22 23 24 Capital Small , Name nu xi omicron pi rho sigma tau upsilon phi chi psi omega
Do you think that the engineer needs units? What is meant by the unit of any quantity? What are the basic units? What is meant by a derived unit? Is there different systems of units?
Basic SI Units Base Unit Ampere Candela Kelvin Kilogram Meter Mole Second Symbol A cd K k m mol s Quantity Electric Current Luminous Intensity Temperature Mass Length Amount of Substance Time
Derived Units with Special Names Units Named After Charles-Augustin de Coulomb Unit of In SI Units 1 A s1 0 C = 273.15 K 1 F = 1 s4 A2 m 2 kg 1 1 G= 1Mx cm 2 1 G= 10 4kg C 1 s 1 1 H = 1kg s 2 A 2 1 Hz = 1s 1 1 kg m2 s 2 1 lm = 1 cd sr 1 lx = 1 lm/m2 Mx = 1G cm2= 10 8Wb Symbol Coulomb C C F Electric Charge Degree Celsius Anders Celsius Temperature Farad Michael Faraday Capacitance Magnetic field Magnetic flux density Inductance Frequency Energy Luminous flux Illuminance Gauss Henry Hertz Joule Lumen Lux Maxwell G H Hz J lm lx Mx Carl Friedrich Gauss Joseph Henry Heinrich Hertz James Prescott Joule James Clerk Maxwell Magnetic flux
Units Newton Named After Sir Isaac Newton Unit of Force Magnetizing field, Magnetizing Force In SI Units 1N = 1kg m s 2 1Am-1= 4 10 3Oe 1 Oe 79.5774715 Am-1 1 = 1kg m2 s 3 A 2 1 rad= 57.296 S= -1 1S = 1kg m 2 s3 A2 1T = 1kg s 2 A 1 1 T= 104G Symbol N Oersted Oe Hans Christian Oersted Ohm Radian Georg Ohm rad Electrical Resistance Angle Ernst Werner von Siemens Electric Conductance, and Electric Admittance Siemens S Magnetic field Magnetic flux density Tesla Nikola Tesla T Alessandro Volta Electric potential, electromotive force Volt V 1V = 1kg m2 s 3 A 1 1W = 1kg m2 s 3 1W = 1 107erg s 1 Watt James Watt Power W Wilhelm Eduard Weber Weber Wb 1Wb = 1kg m2 s 2 A 1 Magnetic flux
Systems of units Metric System Length: meter, m Mass: kilogram, kg Time: seconds, s Electric Charge: Coulomb, ? Temperature: centigrade, Force: Newton, N Energy: Joule (N m), J British System Length: foot (30.48 cm) Mass: Slug (14.6 kg) Time: Second, s Electric Charge: Coulomb, C C Temperature: Fahrenheit, Force: Pound (4.45 N) Energy: Foot-pound (1.356 J)
