Electrical Engineering › Section B · Resistance, Ohm's law, power, and energy › Topic B.1
Resistance of wires and wire tables
Every wire resists current a little, and that small resistance decides how hot a cable runs and how much voltage is lost along it. This topic shows how material, length and thickness set a conductor's resistance, in SI units, in the circular-mil units of US wire tables, and for thin films.
In this topic
- What resistance is
- The resistance formula
- Worked example: a copper wire in SI
- Circular mils
- Worked example: a run of 14 AWG cable
- The American Wire Gauge
- Metric units and sheet resistance
- Worked example: a thin-film resistor
- Linking the two systems
- Common mistakes to avoid
- Key takeaways
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