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UEENEEE003B<br />Solve Problems in Single Path DC Circuits<br />Power<br />
Power<br />Power is the RATE that energy is converted.(unit watts W)<br />Or<br />Power is a measure of the amount of ener...
8/9/2011<br />Revision02<br />3<br />Formula for PowerP =V x IP = V2RP =I2R<br />
During the conversion some input energy(electrical) is changed to heat within the device.<br />The heating of the electric...
Your turn to think<br />What would the current be if the voltage is increased to 3V?<br />What would the current be if the...
Calculate the current drawn for a car battery.<br />Allow 140W for the spark and pump.<br />Allow 100W for the radio and d...
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E003B power

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E003B power

  1. 1. UEENEEE003B<br />Solve Problems in Single Path DC Circuits<br />Power<br />
  2. 2. Power<br />Power is the RATE that energy is converted.(unit watts W)<br />Or<br />Power is a measure of the amount of energy converted in 1 second.<br />The POWER RATING of a device tells the rate that energy is converted:<br />75W lamp<br />750kW motor <br />8/9/2011<br />Revision02<br />2<br />
  3. 3. 8/9/2011<br />Revision02<br />3<br />Formula for PowerP =V x IP = V2RP =I2R<br />
  4. 4. During the conversion some input energy(electrical) is changed to heat within the device.<br />The heating of the electrical device may produce a problem:<br />motors<br />transformers<br />cables<br />In other electrical devices this is rarely a problem:<br />lamps<br />8/9/2011<br />Revision02<br />4<br />Power cont.<br />
  5. 5. Your turn to think<br />What would the current be if the voltage is increased to 3V?<br />What would the current be if the voltage is increased to 10V?<br />What would the current be if the resistance is increased to 2W (V = 1V)<br />8/9/2011<br />Revision02<br />5<br />
  6. 6. Calculate the current drawn for a car battery.<br />Allow 140W for the spark and pump.<br />Allow 100W for the radio and dash panel.<br />Allow 96W for the alternator field.<br />Allow for:<br />head lights (low and high beam)<br />tail lights<br />park lights<br />8/9/2011<br />Revision02<br />6<br />

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