1.3 KiB
1.3 KiB
(Insert diagram here) E : the voltage corresponding to Ua - Ub = Uab V = Ub - Uc The current correponding to the flow of electrical electrons from A to C in A
Dipoles : component between two points of the diagram
Ohm's law: V=R \times{I}
<img src="https://i.imgur.com/a9skJL3.png" /i>
Association of resistors
resistors in serie
R_{1} and R_{4} get the same flow (current). Replace R1 and R4 by R_{s} = R_{1}+R_{4}
Resistors in parallel
R_{2} and R_{3} see the same voltage:
U_{2} = U_{c}-U{b}, U_{3} = U_{d}-U{b} and U_{d} = U_{c}
R_{2} and R_{3} are replaced by R_{P} :
R_{P}=\frac{R_{3}\times{R_{2}}}{{R_{3}+R_{2}}}
Definitions
- A branch is a link between 2 points in the diagram
- A node is a point in the diagram linked to at lease 3 branches
- A loop is a draw from a point in the diagram to itself.
⚠️ In a loop we don't use the same path twice or more
Exemple:
flowchart LR
C --> D --> B --> C
flowchart LR
A --> C --> B --> A
Different laws
Kirchhoff's laws
- The addition of voltages in a loop = 0
exemple :
V_{AC} + V_{CB} + V_{BA} = 0 - The algebraic sum of currents into a node = 0
Exemple :
\text{Node(C)} = I - I_{2} - I_{3} = 0
Kirchhoff's laws & Ohm's law
We can't calculate I, I_{2} and I_{3}