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Homework Help: Amount of power consumed by a non linear light bulb

  1. Jul 23, 2012 #1
    1. The problem statement, all variables and given/known data

    figure 1 shows the relation ship between voltage and current when voltage is applied o a certan light bulb. Next as shown in figure 2, the bulb os connected n series with a 12V battery and 5Ω resitor.
    Figure 1
    Fgure 2

    what is the amount of power consumend by the light bulb?

  2. jcsd
  3. Jul 23, 2012 #2
    The one thing you know is that the (voltage across the bulb) + (voltage across the 5ohm resistor) =12V
    The voltage across the resistor is always going to be Ix5.... look up the current axis for the bulb and find waht current will give a (voltage across the bulb) + Ix5 =12 (it works out quite nicely)
  4. Jul 23, 2012 #3
    ok. thanks
  5. Jul 23, 2012 #4
    did you get 2A x 2V = 4W for the bulb and 2A x 10V = 20W for the resistor?
  6. Jul 23, 2012 #5
    yes. thanks
  7. Jul 23, 2012 #6


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