Calculators
NEC conductor calculations with every step and article shown, for preliminary sizing. The calculators page explains the method and its limits.
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NEC Table 310.16
Conductor ampacity
How much current one conductor may carry, with each correction and the limit that governs.
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NEC sizing
Conductor size
The smallest conductor for a load, with its overcurrent device and grounding conductor.
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AC circuits
Voltage drop
The voltage lost along a conductor you have chosen, and the voltage left at the load.
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Physics Lab
Interactive simulations, each solved numerically in real SI units. The Physics Lab page describes each one in more detail.
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Mechanics
Projectile & orbital motion
A ball flying through air near the ground, and an orbit far above it.
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Equation of state
Pressure, volume & temperature
The ideal gas law drawn as one surface, with van der Waals alongside it.
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Kinetic theory
Ideal gas particle box
Atoms in a box with a piston, where pressure comes from their hits on the walls.
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Heat transfer
Transient heat conduction
Heat moving along a rod over time, with an energy balance that has to close.
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Thermodynamics
Heat engines & the second law
Carnot, Otto, Stirling and Brayton cycles, with every joule accounted for.
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Before you rely on a result
Preliminary only. The calculators are for preliminary sizing, not construction, and the simulations are simplified models. Neither replaces a design sealed by an engineer licensed in your jurisdiction.
Questions or corrections are welcome at [email protected].