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UEENEEE003B Solve Problems in Single Path DC Circuits
The Systeme Internationale’ (SI) is the International Metric System   There are 6 Base Units in the SI system 7/6/2011 Revision02 2 Base Units
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.  . 7/6/2011 Revision02 3 SI Derived Units
7/6/2011 Revision02 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
7/6/2011 Revision02 5 Derived Mechanical Units
7/6/2011 Revision02 6 Derived Electrical Units
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. 7/6/2011 Revision02 7 Multiples And Submultiples
7/6/2011 8 Multiples and Submultiples
7/6/2011 Revision02 9
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 7/6/2011 Revision02 10 Scientific Notation
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 7/6/2011 Revision02 11 Examples:
Move decimal point to right for positive exponent of 10 Move decimal point to left for negative exponent of 10 7/6/2011 Revision02 12 To change from scientific notation to standard form:
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 7/6/2011 Revision02 13
7/6/2011 Revision02 14 Express in correct scientific notation 0.0000568 321 64 960 000 0.07085 61 500
Complete pages of workbook  7/6/2011 Revision02 15 Rounding off

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Ueeneee003 b week 1

  • 1. UEENEEE003B Solve Problems in Single Path DC Circuits
  • 2. The Systeme Internationale’ (SI) is the International Metric System There are 6 Base Units in the SI system 7/6/2011 Revision02 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. . 7/6/2011 Revision02 3 SI Derived Units
  • 4. 7/6/2011 Revision02 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. 7/6/2011 Revision02 5 Derived Mechanical Units
  • 6. 7/6/2011 Revision02 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. 7/6/2011 Revision02 7 Multiples And Submultiples
  • 8. 7/6/2011 8 Multiples and Submultiples
  • 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 7/6/2011 Revision02 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 7/6/2011 Revision02 11 Examples:
  • 12. Move decimal point to right for positive exponent of 10 Move decimal point to left for negative exponent of 10 7/6/2011 Revision02 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 7/6/2011 Revision02 13
  • 14. 7/6/2011 Revision02 14 Express in correct scientific notation 0.0000568 321 64 960 000 0.07085 61 500
  • 15. Complete pages of workbook 7/6/2011 Revision02 15 Rounding off