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Discussion in 'General Electronics Discussion' started by Edsgns, Dec 23, 2016.

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  1. Edsgns

    Edsgns

    1
    0
    Dec 23, 2016
    I am working on a project to clown a coworker. It includes 3 light sockets, 3 switches and an ammeter to show the current draw of each bulb. The bulbs to be used are one led (draws 20 watts), one incandescent bulb (25 watts) and one compact fluorescent (20 watts). The ammeter ranges from 0-1 amp. What I am trying to do is make the ammeter show around .8 amps+ When I turn on the fluorescent. Using ohms law on a 120 volt circuit to calculate the resistance (R=V/I) R = 120/.8 so I need 150 ohms. I have an 150 ohm 10 watt resistor but not sure that the 10 watts is enough.
     
  2. Bluejets

    Bluejets

    4,851
    1,016
    Oct 5, 2014
    I make it 96w.

    Calculation is I ^2 R or V * I

    This site will make it easier for you.................http://www.csgnetwork.com/ohmslaw2.html

    Just note that a 20w fluro will draw more than 20w.
     
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