Impedance of a DC circuit

Electricity and Magnetism Level 2

What is the impedance (in Ω \Omega ) of a series DC circuit with impedance L = 4 H L = 4 \text{H} and resistance R = 3 Ω ? R = 3 \Omega?

7 3 0 5

July Thomas by July Thomas , 30, USA

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1 solution

Assuming the inductor and the resistor are connected in series, the effective impedance would be the sum of the respective impedances of the resistor and the inductor. At DC (0 Hz), the inductor has zero impedance (Z = j 2 pi f L). Thus, the effective impedance is simply the impedance of the resistor, which would be its resistance, 3 Ohms.

Note that if the inductor and the resistor were connected in parallel, the answer would be 0 Ohms.

4 Helpful 0 Interesting 0 Brilliant 0 Confused

Thanks! I updated the problem's wording to indicate they are connected in parallel.

July Thomas - 4 years, 11 months ago

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