Circuits - PowerPoint PPT Presentation

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Circuits

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Electric Circuits Circuit ... the individual devices is equal to the total voltage supplied by the source Vtotal = V1 + V2 + V3 In Parallel In Parallel ... – PowerPoint PPT presentation

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Title: Circuits


1
Circuits
  • 4/17/10

2
Electric Circuits
  • Circuit Any path along which electrons can flow
  • For a continuous flow of electrons, there must be
    a complete circuit with no gaps
  • A gap is usually provided by an electric switch
    that can be opened or closed to either cut off or
    allow electron flow

3
In Series
4
In Series
  • Current passing through each electric device is
    the same
  • I1 I2 I3
  • Total resistance to current in the circuit is the
    sum of the individual resistances along the
    circuit path
  • Rtotal R1 R2 R3
  • Vtotal IRtotal
  • Ohms Law applies across each individual device
  • V1 IR1 V2 IR2 V3 IR3
  • Sum of the voltage drops across the individual
    devices is equal to the total voltage supplied by
    the source
  • Vtotal V1 V2 V3

5
In Parallel
6
In Parallel
  • Voltage is the same across each device
  • V1 V2 V3
  • Total current in the circuit equals the sum of
    the currents in its parallel branches
  • Itotal I1 I2 I3
  • Ohms Law applies across each individual device
  • V I1R1 V I2R2 V I3R3
  • Overall resistance of the circuit is less than
    the resistance of any one of the branches
  • 1/Rtotal 1/R1 1/R2 1/R3

7
Combining Resistors
  • Series Rtotal R1 R2 R3
  • Parallel 1/Rtotal 1/R1 1/R2 1/R3

8
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