Circuit Theory Flashcards
1
Q
Define an electronic circuit
A
an inter-connection of devices /elements in an electrical system
2
Q
What is the purpose star/delta transformations?
A
Allows us to convert resistances in a 3 phase confirguration to simplify complex linear circuits.
3
Q
How do we go from ∆ to Y?
A
Ra = (R2R3) / (R1+ R2 + R3)
Rb = (R1R3) / (R1 +R2 + R3)
Rc = (R1*R2) / (R1 + R2 + R3)
4
Q
How do we go from Y to ∆?
A
R1 = (RbRc / Ra) + Rb + Rc
R2 = (RaRc / Rb) + Ra + Rc
R3 = (Ra*Rb / Rc) + Ra + Rb
5
Q
Define current
A
The rate of flow of charge
6
Q
Define voltage
A
The electrical energy over charge
7
Q
Define power
A
The rate of energy transfer
8
Q
What are the steps for nodal analysis?
A
- Change all the resistances to conductance
- Choose a reference node and label major nodes
- Make a matrix of G and current going into nodes
- V = G^-1 x I
