Delta And Wye

Question 1

Ra

Answer 1

(R1R2+R2R3+R1R3)/R1

Question 2

Rb

Answer 2

(R1R2+R2R3+R1R3)/R2

Question 3

Rc

Answer 3

(R1R2+R2R3+R1R3)/R3

Question 4

R1

Answer 4

(Rb*Rc)/(Ra+Rb+Rc)

Question 5

R2

Answer 5

(Ra*Rc)/(Ra+Rb+Rc)

Question 6

R3

Answer 6

(Ra*Rb)/(Ra+Rb+Rc)

Question 7

Describe a delta

Answer 7

Triangle, 3 nodes A, B, C. With respective resistances across from each node. I.e. Ra is across from node A

Question 8

Describe Wye

Answer 8

Y shaped: 3 nodes A, B, C. R1 @ node a, R2 @ node b, R3 @ node c.

Question 9

General rule for delta resistance

Answer 9

Delta Resistance= sum of products of y-resistances taken in pairs/ opposite y-resistance

Question 10

General rule for y-resistance

Answer 10

Y-resistance= product of adjacent delta resistances/sum of delta resistances