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incandescent bulb power consumption

Discussion in 'Electronic Basics' started by Mike, Oct 29, 2004.

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  1. Mike

    Mike Guest

    How can a 60W bulb only draw 60W of power if it's internal resistance is 19
    ohms? Or does the resistance suddenly increase once the filament heats up?

    Thanks.
     
  2. Yes, considerably. In the UK, with about 235 V mains ac voltage, a 60W
    bulb would have a hot resistance of about 1k.
     
  3. Clarence

    Clarence Guest

    Oh yea! Typical 5/1, sometimes more.
     
  4. Mike

    Mike Guest

    Thanks. That makes perfect sense now...
     
  5. R.Spinks

    R.Spinks Guest

    I believe this site should give you the information for which you are
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  6. Joel Kolstad

    Joel Kolstad Guest

    Measuring the resistance of a light bulb is a common elementary circuits
    class laboratory to get students thinking about resistance as not being
    particularly fixed. It's very enlightening to many of them!
     
  7. Ken

    Ken Guest

  8. dB

    dB Guest


    Your question has been answered in previous posts but for your
    interest it is precisely that phenomena which is exploited when a
    small filament bulb is used for amplitude control in a Wein bridge
    oscillator.
     
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