Gear or pulley ratio from tooth counts or diameters, with the output speed and torque for a given input rpm, torque and efficiency.
Shell and head thickness to ASME VIII-1 (UG-27, UG-32), the plate to buy, the MAWP it gives you and the hydrotest pressure — with the formulas shown.
Friction loss for water in a pipe — velocity, Reynolds number, Swamee–Jain friction factor, Darcy–Weisbach head loss in feet and psi.
NEC copper ampacity for AWG 14–2 at 60/75/90 °C, plus the voltage drop and percent drop over a run at your load current.
Resistance, power and conductance from a voltage and a current — V = I·R and P = V·I, solved for a DC circuit.
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