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# E003B multiples & si units

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### E003B multiples & si units

1. 1. UEENEEE003B<br />Solve Problems in Single Path DC Circuits<br />Multiples, Sub Multiples and SI Units<br />
2. 2. The Systeme Internationale’ (SI) is the International Metric System <br />There are 6 Base Units in the SI system<br />8/9/2011<br />Revision02<br />2<br />Base Units<br />
3. 3. The six basic units are not sufficient to act for all situations that arise in measurement.<br />Derived units are used for all non-basic situations.<br />Most derived units use the three basic units of length, mass and time in various combinations. <br />.<br />8/9/2011<br />Revision02<br />3<br />SI Derived Units<br />
4. 4. 8/9/2011<br />Revision02<br />4<br />SI Derived Units<br />The units used can be subdivided into three groups: <br />mechanical, electrical and magnetic <br />although it must be realised there are many more examples than those listed<br />
5. 5. 8/9/2011<br />Revision02<br />5<br />Derived Mechanical Units<br />
6. 6. 8/9/2011<br />Revision02<br />6<br />Derived Electrical Units<br />
7. 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.<br />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.<br />8/9/2011<br />Revision02<br />7<br />Multiples And Submultiples<br />
8. 8. 8/9/2011<br />8<br />Multiples and Submultiples<br />
9. 9. 8/9/2011<br />Revision02<br />9<br />
10. 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.<br />For example, 6 800 000 can be expressed as<br />6.8 x 106and <br />1250 as 1.25 x 103<br />8/9/2011<br />Revision02<br />10<br />Scientific Notation<br />
11. 11. Given: 1.015 x 10 -8<br />Answer: 0.00000001015 (8 places to left)<br />Negative exponent move decimal to the left<br />Given: 5.024 x 10 -3<br />Answer: 5,024 (3 places to the right)<br />Positive exponent move decimal to the right<br />8/9/2011<br />Revision02<br />11<br />Examples:<br />
12. 12. Move decimal point to right for positive exponent of 10<br />Move decimal point to left for negative exponent of 10<br />8/9/2011<br />Revision02<br />12<br />To change from scientific notation to standard form:<br />
13. 13. Examples<br />Express in standard form<br />1.09 x 10 3<br />4.22715 x 10 8<br />3.078 x 10 – 4<br />9.004 x 10 – 2<br /> 5.1874 x 10 2<br />8/9/2011<br />Revision02<br />13<br />
14. 14. 8/9/2011<br />Revision02<br />14<br />Express in correct scientific notation<br />0.0000568<br />321<br />64 960 000<br />0.07085<br />61 500<br />
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