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E003B power

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Transcript

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