resistors

Discussion in 'Homework Help' started by dlmcknny63, Jan 17, 2009.

  1. dlmcknny63

    Thread Starter Member

    May 25, 2008
    11
    0
    a 4 ohm resistor is connected across a 12 volt battery.How much power will the resistor dissipate?
     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. mik3

    Senior Member

    Feb 4, 2008
    4,846
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    P=V*I or

    P=(V^2)/R or

    P=(I^2)*R

    where

    P=power in Watts
    V=voltage across the resistor in Volts
    I=current through the resistor in Amps
    R=resistance of the resistor in Ohms

    Choose one and make the calculation, the second one suits better in your case because you know the voltage across the resistor and R.
     
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