Test: Basic AC Parallel Circuits - Electrical Engineering (EE) MCQ

In a parallel circuit, we consider admittance instead of impedance, where admittance is the reciprocal of impedance.

 In a parallel circuit, we consider admittance instead of impedance, where admittance is the reciprocal of impedance.

We know that impedance is the reciprocal of admittance, hence the correct expression for impedance is: Z=1/Y.

 We know that admittance is the reciprocal of impedance, hence the correct expression for admittance is: Y=1/Z.

 The unit for admittance is ohm^-1 because the unit of impedance is ohm and admittance is the reciprocal of impedance.

 As the impedance increases, the admittance decreases because admittance is equal to 1/impedance.

We know that: Y=1/Z.
Substituting the value of Z from the question, we get Y= 0.25 ohm^-1.

We know that: Z=1/Y.
Substituting the value of Y from the question, we get Z= 0.1 ohm.

 In a parallel circuit, if one bulb blows out, it acts as an open circuit. Current does not flow in that branch but it continues to flow in the other branch hence the bulb continues to glow.

In parallel circuits, the current across the circuits vary whereas the voltage remains the same.