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example of impedence calculation

bazzel

Nov 10, 2011
18
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Nov 10, 2011
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Hello all. I am having a problem working this kind of problem out.

If I have a series RL circuit and I know the inductance of the coil in henrys, the resistance of the resistor in ohms. It is an ac circuit but I dont know the frequency

My question is. Can I work out the reactance without the frequency? And, can i work out the impedance in the circuit with those numbers.

An example would be appreciated. Thankyou
 

GreenGiant

Feb 9, 2012
842
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Feb 9, 2012
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842
you would need the frequency

You could use the formula to create a curve that is based on frequency, and therefor create a curve of the impedance

But without the frequency you wont get numbers, only equations
 

bazzel

Nov 10, 2011
18
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Nov 10, 2011
Messages
18
cheers. What about in a RC circuit. Would I still need the frequency to work out capacitive reactance?
 

davenn

Moderator
Sep 5, 2009
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Sep 5, 2009
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14,251
cheers. What about in a RC circuit. Would I still need the frequency to work out capacitive reactance?

yes you do

go and have a look at the formula, see on the bottom line the f = frequency :)

cheers
Dave
 
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