// multi-utility computation suite · offline · instant · precise
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│ [c] calcalyst_ │
│ computation suite │
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eng.wire-resistance Calculator
Calculates wire resistance from material resistivity, length, and cross-sectional area, and voltage drop and power loss at a given current. Voltage drop in wiring must be limited to 3% for branch circuits (NEC recommendation) — this constrains the maximum cable length at a given gauge.
Inputs
Rho U
Reference formula or conversion factor shown for context.
L
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
D
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
I
Rate of charge flow (A). I = V/R. Above ~100 mA through the body can be lethal. Fuses protect against overcurrent.
Results
resistance (Ω)
Opposition to current flow (Ω). Ohm's Law: V = IR. Lower resistance means more current for the same voltage.
voltage drop (V)
Electric potential difference between the two terminals (V). In AC systems, quoted as RMS — 230 V mains has a peak of ~325 V.
power loss (W)
The decrease or degradation from the baseline.
Ω per km
Reference formula or conversion factor shown for context.
cross-section (mm²)
Sample size or count used in the calculation.
AWG equiv.
Reference formula or conversion factor shown for context.