What is the resistance of a 15m long wire with a cross-sectional area of 2 mm2?
| July 26, 2021 | education
What is the resistance of a 15m long wire with a cross-sectional area of 2 mm2? The specific resistance of the material is 0.016 (Ohm × mm2) / m.
The resistance of the wire is determined by the formula
R = L * r / s,
where
R – resistance of the wire Ohm;
L – length in meters;
r – resistivity Ohm * mm² / m;
s – cross-sectional area of the wire mm².
Substitute the values and calculate
R = 15 * 0.016 / 2 = 0.12 Ohm.
Answer: wire resistance 0.12 ohms.
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