Resistor Size Question 2

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Rsistor Size Question 2

Post by Guest » Sat Dec 24, 2005 11:26 pm

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

Sarah

Post by Sarah » Tue Jan 03, 2006 9:53 am

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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