Basic Theory
Resistance Concept and Calculation
Resistance Concept and Calculation Definition of Resistance Resistance is a measure of a conductor's opposition to current flow. Resistance Law - R: Resistance…
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ResistanceResistivityCalculationBasics
Resistance Concept and Calculation
Definition of Resistance
Resistance is a measure of a conductor's opposition to current flow.
Resistance Law
R = ρ × L / SInfluencing Factors
Common Material Resistivity
| Material | Resistivity (Ω·m, 20°C) |
|---|---|
| Silver | 1.65×10⁻⁸ |
| Copper | 1.75×10⁻⁸ |
| Aluminum | 2.83×10⁻⁸ |
| Iron | 9.78×10⁻⁸ |
Resistance Calculation Example
Example: Calculate the resistance of a copper wire with length 100m and cross-sectional area 2.5mm².
R = ρ × L / S
R = 1.75×10⁻⁸ × 100 / (2.5×10⁻⁶)
R = 0.7Ω After reading
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