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Ohms Law for figuring amp rating of a resistor    
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John1397



Joined: 16 Aug 2007
Posts: 44
PostPosted: Sat Aug 18, 2007 9:33 am    Post subject: Ohms Law for figuring amp rating of a resistor Reply with quote
I would like to know using ohms law if you have 100 volts dc going to a resistor that is rated 2 watt and has 10 ohms resistance if this resistor were to be used like a fuse what amp rating would it be?

I came up with .02 amps .45 amps and 10 amps
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kuhurdler



Joined: 28 Dec 2006
Posts: 2879
Location: Overland Park, KS
PostPosted: Sat Aug 18, 2007 11:43 am    Post subject: Reply with quote
V=IR
P=VI or I=P/V

If you have 100V on one side (assuming 0 volts on the other side)

2Watts/100V=.02Amps or 20 mA

make sure you use an appropriate resistor for this (not a carbon resistor). I think wirewound resistors are sometimes used for this. I'm not sure how much higher or lower they have to be for fused applications.

These questions are great. Keep em coming.
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