Resistor Size Question 2

 
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Guest
PostPosted: Sat Dec 24, 2005 11:26 pm    Post subject: Rsistor Size Question 2 Reply with quote
I have a reed relay switch that is rated @:

5volts
250kohms
18ma

I will be switching the relay with 5.85 to 6.75 volts.

How do I or what is the equation to figure out the size of resistor that I need?

what does the watting mean on a resistor?

Thank You
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Sarah
Guest
PostPosted: Tue Jan 03, 2006 9:53 am    Post subject: Reply with quote
Hi

Thank you for your post.

You need to use a potential divider. You can find more information and the equation on websites such as this:

http://www.technologystudent.com/elec1/resist2.htm

Best Regards
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