diff --git a/source/electronics/components.rst b/source/electronics/components.rst
index fdeed9b..b652407 100644
--- a/source/electronics/components.rst
+++ b/source/electronics/components.rst
@@ -1,5 +1,5 @@
Components
----------------
+===============
Two types of electronic components:
1) Active: Source of energy (includes amplifying components such as transistors).
@@ -13,10 +13,33 @@ Two types of electronic components:
:width: 200px
Generators
-^^^^^^^^^^^^
+----------------
.. include:: esl.rst
There are two important generators to know:
1) Current generators |igen_c| that strive to maintain constant current on his terminals. Arrow must point towards the current direction (`source `__).
2) Voltage generators |igen_v| that strive to maintain constant voltage on his terminals.
+
+Resistors
+-------------
+Two ways of connecting resistors: 1) series 2) parallel
+
+Series
+~~~~~~~
+.. image:: figures/resistor_serie.svg
+ :align: center
+ :width: 130px
+
+Equivalent resistors is simply :math:`R=R_1+R_2`.
+
+Parallel
+~~~~~~~~~~~~
+
+.. image:: figures/resistor_parallel.svg
+ :align: center
+ :width: 100px
+
+
+Equivalent resistors is :math:`\frac{1}{R}=\frac{1}{R_1}+\frac{1}{R_2} \Rightarrow R = \frac{1}{\frac{1}{R_1}+\frac{1}{R_2}}`.
+With only two resistors, it is simply :math:`\frac{R_1R_2}{R_1+R_2}`.
\ No newline at end of file
diff --git a/source/electronics/esl.rst b/source/electronics/esl.rst
index b663c99..3508b91 100644
--- a/source/electronics/esl.rst
+++ b/source/electronics/esl.rst
@@ -2,4 +2,4 @@
:width: 80px
.. |igen_v| image:: figures/gen_v.svg
- :width: 58px
\ No newline at end of file
+ :width: 58px
diff --git a/source/electronics/figures/resistor_parallel.svg b/source/electronics/figures/resistor_parallel.svg
new file mode 100644
index 0000000..7c82ba2
--- /dev/null
+++ b/source/electronics/figures/resistor_parallel.svg
@@ -0,0 +1,117 @@
+
+
+
+
diff --git a/source/electronics/figures/resistor_serie.svg b/source/electronics/figures/resistor_serie.svg
new file mode 100644
index 0000000..e97c7c2
--- /dev/null
+++ b/source/electronics/figures/resistor_serie.svg
@@ -0,0 +1,103 @@
+
+
+
+
diff --git a/source/electronics/thevnort.rst b/source/electronics/thevnort.rst
index e2e5887..ee2c22c 100644
--- a/source/electronics/thevnort.rst
+++ b/source/electronics/thevnort.rst
@@ -1,2 +1,2 @@
Thévenin's And Norton's Theorems
--------------------------------
\ No newline at end of file
+=======================================
\ No newline at end of file