RLC Circuit With Complex Numbers Question - Please help

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username4438464
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#1
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#1
Determine the resistance, R and series inductance L (or capacitance C) for each of the following impedances assuming the frequency is 50Hz.

i - (6 + j9) Ω
ii - (7 - j8) Ω
iii - j15Ω
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RDKGames
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#2
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(Original post by Randall9618)
Determine the resistance, R and series inductance L (or capacitance C) for each of the following impedances assuming the frequency is 50Hz.

i - (6 + j9) Ω
ii - (7 - j8) Ω
iii - j15Ω
Not sure this is in the right forum for this question... it looks it has some uncommon terminology, specific to a different subject.
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DFranklin
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(Original post by RDKGames)
Not sure this is in the right forum for this question... it looks it has some uncommon terminology, specific to a different subject.
Yeah, it's physics/electronics (+outside of my knowledge base - I just know enough to say that...)
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RDKGames
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(Original post by DFranklin)
Yeah, it's physics/electronics (+outside of my knowledge base - I just know enough to say that...)
I suppose moving it to Physics would be better than leaving it here then.
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username4438464
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(Original post by RDKGames)
I suppose moving it to Physics would be better than leaving it here then.

Sorry guys. Well spotted
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Joinedup
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#6
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The real part is the resistance and the imaginary part is the reactance
so for (6+j9) the resistance is 6 ohms and the reactance is 9 ohms inductive reactance XL (+ve j means inductance)
and for (7-j8) the resistance is 7 ohms and the reactance is 8 ohms capacitive reactance XC (-ve j means capacitive)

the formula for inductive reactance is XL = 2πfL
the formula for capacitive reactance is XC = 1/(2πfC)

so you need to rearrange those to make C or L the subject and sub in the given frequency of 50Hz
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Eimmanuel
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#7
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I change the title a bit so that it looks more like a physics thread.
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