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simple resistor problem

 
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ramses_II
HG Junior


Joined: 21 Sep 2006
Posts: 10

PostPosted: Sat Sep 30, 2006 2:34 am    Post subject: simple resistor problem Reply with quote

I have a simple problem with resisistor calculating.

I have a 9V battery and I want to light up a led that needs 2v and 10mA.

R = V / I
R = (9 - 2) / 0.01
R = 700 ohms

Does this means that I have to use a 700 ohm resistor or is it 700 Kilo-ohm resistor....
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ramses_II
HG Junior


Joined: 21 Sep 2006
Posts: 10

PostPosted: Sat Sep 30, 2006 5:44 am    Post subject: Reply with quote

problem solved


it looks like its 700 ohm

i tried with 700 Kilo ohm.....doesn't work....lol

looks like 700x needed resistance

And I have a some good news I have finished with my bicycle projects.....

I'll post it in a new topic
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Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Sat Sep 30, 2006 1:25 pm    Post subject: Reply with quote

R = V / I

You are exactly correct. Most people make the mistake of using mA when doing the calculation, but it is correct to convert to the amps scale first as you did.
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