E003B multiples & si units

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  • 1. UEENEEE003B
    Solve Problems in Single Path DC Circuits
    Multiples, Sub Multiples and SI Units
  • 2. The Systeme Internationale’ (SI) is the International Metric System
    There are 6 Base Units in the SI system
    8/9/2011
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    2
    Base Units
  • 3. The six basic units are not sufficient to act for all situations that arise in measurement.
    Derived units are used for all non-basic situations.
    Most derived units use the three basic units of length, mass and time in various combinations.
    .
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    3
    SI Derived Units
  • 4. 8/9/2011
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    4
    SI Derived Units
    The units used can be subdivided into three groups:
    mechanical, electrical and magnetic
    although it must be realised there are many more examples than those listed
  • 5. 8/9/2011
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    5
    Derived Mechanical Units
  • 6. 8/9/2011
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    6
    Derived Electrical Units
  • 7. In practical cases some SI values are inconveniently large or small, In order to choose values that are convenient to handle, multiples or submultiples are used.
    For example, if the resistance of an electrical installation is measured at 15 000 000 ohms, it is more convenient to refer to this value as 15 megohms.
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    7
    Multiples And Submultiples
  • 8. 8/9/2011
    8
    Multiples and Submultiples
  • 9. 8/9/2011
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    9
  • 10. Another method of overcoming cumbersome rows of figures is to notate numbers to a value between 1 and 10 multiplied by 10 to some power.
    For example, 6 800 000 can be expressed as
    6.8 x 106and
    1250 as 1.25 x 103
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    10
    Scientific Notation
  • 11. Given: 1.015 x 10 -8
    Answer: 0.00000001015 (8 places to left)
    Negative exponent move decimal to the left
    Given: 5.024 x 10 -3
    Answer: 5,024 (3 places to the right)
    Positive exponent move decimal to the right
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    11
    Examples:
  • 12. Move decimal point to right for positive exponent of 10
    Move decimal point to left for negative exponent of 10
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    12
    To change from scientific notation to standard form:
  • 13. Examples
    Express in standard form
    1.09 x 10 3
    4.22715 x 10 8
    3.078 x 10 – 4
    9.004 x 10 – 2
     5.1874 x 10 2
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    13
  • 14. 8/9/2011
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    14
    Express in correct scientific notation
    0.0000568
    321
    64 960 000
    0.07085
    61 500