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AC Impedance

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Scholar

Karma Points: 271

Respect (77%):

Date Posted: 7/15/2008 1:59:01 AM Status: Live

AC Impedance

Course	Textbook	Chapter	Problem
N/A	Circuits by Franco	11	15

Question Details:

a) Find the inductance needed to achieve an impedance of j10 Ω at 100 kHz. What is its reactance at 1 kHz?

b) Find the capacitance needed to achieve an impedance of -j5 Ω at 10 kHz. What is its reactance at 1 MHz?

c) Find the resistance neededto achieve an impedance of 100 Ω at 60 Hz.

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Answers:

prince_s

Expert

Karma Points: 1,069

Date Posted: 7/15/2008 2:29:39 AM Status: Live

Asker's Rating: Lifesaver

Response:

Inductive Reactance

where f= frequency

L=Inductance

Given that X_L=j10Ω

f=100kHz

Reacatance at 1kHz is

Capacitive Reactance =

Given that Xc=-j5Ω

frequency f=10kHz

∴

and Capacitive Reactance at 1MHz is

Resistance does not dependens upon the frequency.

So resistance =100Ω

I hope this helps you................

aash's Comment:

Well done, thank you very much

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