diff --git a/docs/1b/ece140.md b/docs/1b/ece140.md
index b44e071..5a1c2c1 100644
--- a/docs/1b/ece140.md
+++ b/docs/1b/ece140.md
@@ -114,3 +114,15 @@ $$\sum i_\text{entering node}=0$$
 Kirchoff's **voltage law** states that the sum of all voltage in a **closed loop** must be zero.
 
 $$\sum v_\text{loop}=0$$
+
+### Nodal analysis
+
+Nodal analysis uses the voltages at the **nodes** instead of elements to calculate things in a three-step process:
+
+1. Determine a reference node with $v=0$ and stick a ground out of that node.
+2. Use KCL and Ohm's law on non-reference nodes to get their currents in terms of the reference node.
+3. Solve the system of equations with the formula below.
+
+On either side of a resistor, the current flowing that entire segment can be determined via the following formula:
+
+$$i=\frac{v_\text{higher}-v_\text{lower}}{R}$$