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Inst Tools > Blog > Electrical Theory > Impedance in RL Circuits

Impedance in RL Circuits

Last updated: July 30, 2018 8:01 pm
Editorial Staff
Electrical Theory
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Impedance is the resultant of phasor addition of R and XL.

The symbol for impedance is Z.

Impedance is the total opposition to the flow of current and is expressed in ohms.

The below Equation is the mathematical representation of the impedance in an RL circuit.

Impedance in RL Circuits

Example:

If a 100 Ω resistor and a 60 Ω XL are in series with a 115V applied voltage (Figure 6), what is the circuit impedance?

Simple RL Circuit

Figure 6 : Simple R-L Circuit

Solution:

Impedance in RL Circuits

Z = √ (1002 + 602)

Z = √ 13600

Z = 116.6 Ω

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