Circuits
- Ohm's law V = IR; power P = VI = I²R
- Capacitor impedance Z = 1/(jωC); inductor Z = jωL
- Complex power S = P + jQ; power factor = P/|S|
Systems and signals
- RC time constant τ = RC; RL time constant τ = L/R
- Nyquist: sample faster than twice the highest frequency
- Second-order systems: ζ < 1 is underdamped
Power and electronics
- Three-phase power P = √3 VL IL cos θ
- Transformer: V₁/V₂ = N₁/N₂
- Inverting op-amp gain = −Rf/Rin
Digital and computing
- De Morgan: (AB)′ = A′ + B′
- n bits represent 2ⁿ values
- Two's complement negates by inverting bits and adding 1
Test yourself on FE
Reading a summary is the easy part. Take the free 10-question diagnostic to see which of these domains you actually have, then drill the rest.