Asked by student

Two relays each with 20 ohms resistance and 0.16 henry inductance are connected in series. What is the equivalent impedance?
Answered by test
Would't frequency matter?
Answered by student
No frequency given
Answered by bobpursley
Z=40+j2*(2PI*f*.16)

so not knowing f, equivalent impedance is difficult to put a number on.
Answered by Student
What if the frequency is 30hertz?
Answered by Student
Where did u get the 40 in the impedance?
Answered by bobpursley
if f=30, put that in, calculate Z. You can write it in polar form, if you are familiar with that. http://hyperphysics.phy-astr.gsu.edu/hbase/electric/impcom.html
The real part 40 represents two 20 ohm resistors.
Answered by Student
I don't know how to get
Answered by Student
Rectangular form
Answered by Henry
Given:
F = 60 Hz (selected).
R = 20+20 = 40 Ohms.
L = 0.16+0.16 = 0.32 henry.

Z = R + jXl = R + jWL.
Z = 40 + j377*0.32,
Z = 40 + j120.64 = 127.1 Ohms.

Note: W = 2pi*F = 377 at 60Hz.

Answered by Henry
Z = 40 + j120.64 = 127.1 Ohms[71.6o].
Tan A = 120.64/40 = 3.016,
A = 71.6o.
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