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E003 b ohms law

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E003 b ohms law

1. 1. 8/9/2011<br />Revision02<br />1<br />Time for some calculations<br />
2. 2. Not by accident, but by good planning the values or sizes of the:<br />volt<br />amp<br />ohm<br />are just right for the following.<br />A voltage of 1v will cause a current of 1a to flow through a resistor of 1w.<br />8/9/2011<br />Revision02<br />2<br />Ohm’s law<br />
3. 3. POINTS<br />The current is proportional to voltage.<br />They both go up together<br />They both go down together<br />The current is inversely proportional to resistance.<br />When one goes up the other goes down and, vice versa.<br />Let’s wire a circuit.<br />8/9/2011<br />Revision02<br />3<br />Ohm’s law continued<br />
4. 4. Calculations<br />V = IR<br />V = Voltage in volts<br />I = Current in amps<br />R = Resistance in ohms<br />8/9/2011<br />Revision02<br />4<br />
5. 5. I is inversely proportional to R<br />8/9/2011<br />Revision02<br />5<br />I is proportional to V<br />
6. 6. 8/9/2011<br />Revision02<br />6<br />Something like this:<br />
7. 7. To Calculate I<br />Write the formula<br />I =<br />I = <br />Answer = 12A<br />8/9/2011<br />Revision02<br />7<br />V<br />R<br />120<br />10<br />
8. 8. To Calculate V<br />V = IR<br /> = 6 x 6<br />Answer = 36V<br />8/9/2011<br />Revision02<br />8<br />
9. 9. To calculate R<br />Answer = 5W<br />8/9/2011<br />Revision02<br />9<br />