Blog
Notes on formulas & problem solving
Worked walkthroughs, common mistakes, and the history behind the equations we reference every day.
ElectricalJul 2, 2026
Why Ohm's Law breaks down in AC circuits (and what replaces it)
A closer look at impedance, reactance, and where the simple V=IR model stops being enough.
V = I · Z
Computer ScienceJun 28, 2026
Big-O in five minutes: reading time complexity like an engineer
A practical guide to spotting O(n), O(log n), and O(n²) in real code before you profile it.
O(n log n)
MechanicalJun 21, 2026
Statics vs dynamics: the mistake most students make first
Why forgetting acceleration terms is the single most common statics-exam error — with two worked fixes.
ΣF = ma
CivilJun 14, 2026
Reading a beam bending-stress diagram at a glance
A visual method for estimating maximum stress before you touch a calculator.
σ = M·y / I
ChemicalJun 6, 2026
Rate laws, explained without the jargon
How reaction order actually changes the shape of a concentration-vs-time curve.
r = k[A]ⁿ
PhysicsMay 30, 2026
Kinetic vs potential energy: a five-formula refresher
The core energy equations every discipline eventually borrows from physics.
KE = ½mv²