Ohms

Discussion in 'The Projects Forum' started by Lightfire, Apr 14, 2011.

  1. Lightfire

    Thread Starter Well-Known Member

    Oct 5, 2010
    690
    21
    Hello,

    In ohm's law, there are four categories. The voltage, current, wattage and the resistance.

    Voltage is measured in volts.
    Current is measured in amperes.
    Wattage is measured in watts.
    And resistance is measured in ohms. Am I correct?:confused:

    To get the ohms of one electrical device, I should divide voltage (volts by current (amps)? Am I correct?:confused:

    Means, if I have 12 volts, 5 watts lamp. I will get about 0.4166666666666667 amperes.

    12 divided by 0.4166666666666667 equals 28.799999999999997. Right?

    Am I correct?

    Thank you.
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,344
  3. Markd77

    Senior Member

    Sep 7, 2009
    2,803
    594
    Looks right. Lightbulbs are complicated though, if you measured the resistance when not lit, it would be much lower. This is because metals increase in resistance as they get hotter, and the filament in a lightbulb is very hot.
     
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