Equations, not guesswork
Physics & mathematics
Reproducible, step-by-step calculations for engineering students, with SI units and explicit model assumptions.
Calculation modules
Circuit nodal analysis
Uses your actual connection graph and an independent linear DC solver.
Ohm, power & energy
Ideal resistive circuit: voltage, resistance, and duration.
Calculation notebook
1. Ohm’s law: I = V/R = 12/3000 = 4 mA
2. Power: P = VI = 48 mW
3. Charge: Q = It = 40 mC
4. Energy: E = Pt = 480 mJ
5. KVL: V − IR = 0 V; KCL: Iin − Iout = 0 A.
These modules support the stated equations only. Arbitrary symbolic algebra, general Laplace transforms, CFD, and finite-element fields are not implemented. Review numerical validation →