Quiz 3P
Delta (Δ) – Wye (Y) Circuit
Name: Answer Key
Date of submission: March 3, 2021 @ 7:00 PM (late submission means score deduction)
Important: Write your name in the solutions you provided.
Fill-in the blanks and show your solution. You may take photo of your solution and submit it together
with your answer.
Problem Solving (16 pts)
I.
From the given circuit. Calculate the following. Fill-in the blanks. Assume E = 100 V. Show your
step-by-step solution with simplified schematic diagram in every step.
Resistance
II.
Voltage
Current
Calculate the following. Fill-in the blanks. (2 points each)
1. Calculate the voltage at RL when the selector switch is at positions V1, V2, and V3.
Selector position
V1
V2
V3
Voltage at RL
81.0596265 V
52.30769231 V
27.01986755 V
2. With 30 V applied across two equal resistors in series, 10 mA of current flows. Calculate
the value of R1 and R2.
R1
R2
1.5 kΩ
1.5 kΩ
3. Basing on the figure below, rank the total resistance of the following (in order from highest
resistance to lowest resistance). Assume that each bulb has the same rating and type.
Example:
A__ greater than C__ greater than E__ greater than B__ greater than D__ greater than
Your answer:
_B_ greater than _E_ greater than _A_ greater than _D_ greater than _C_
4. Calculate the output voltage, Vo of the power supply shown below.
I2 = 2.71/1.5k = 1.8066666 mA
E = E3.3k + E2.7k + E1.5k
E = (1.806666 mA) (3.3k+2.7k+1.5k)
E = 13.55 V
Vo
13.55 V