Electric Circuits
The delta equation of given star connected impedance ZQR is equal to

 (5 + j10 / 3) Ω.
 (20 + j10) Ω.
 40 Ω.
  (10 + j30) Ω.

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Electric Circuits
What is called the instantaneous value of an alternating current?

 The value of alternating frequency at any instant.
 The value of peak current at any instant.
 The value of alternating quantity at any instant.
 The value of peak quantity at any instant.

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