Carbon-filament lamp

A contemporary sketch model

Every number below is a modern illustrative assumption. The historical drawing supplies a question; the source model is an exercise in reasoning about it.

voltage = 100 V "Illustrative modern supply assumption"
resistance = 200 ohm in 100..400 ± 10% "Assumed operating-temperature resistance"
current := voltage/resistance [A]
power := voltage*current [W]
check powerBudget: power <= 60 W
check currentBudget: current <= 0.6 A
sweep Filament: resistance = 100, 200, 400 ohm

Model limits

DC electrical sizing only; no radiation, temperature-dependent resistance, vacuum physics, brightness or lifetime prediction.

Explore it with your agent

Create a Study, inspect the installed capabilities, and use this source as a starting point. Ask the agent to explain the equations and assumptions, then replace illustrative inputs with measured evidence for your own design.

This example includes a scalar sweep. Use napkin_sketch to add the model and napkin_run to inspect the sweep; the source editor’s scalar comparison view is for simple scenarios.