What is the resistance of a steel wire if its length is 40 cm and its cross-sectional area is 0.5 mm2?
| January 9, 2021 | education
What is the resistance of a steel wire if its length is 40 cm and its cross-sectional area is 0.5 mm2? The specific resistance of steel is 0.15 Ohm • mm2 / m.
Given:
L = 40cm = 0.4m;
S = 0.5mm ^ 2;
p = 0.15 (Ohm * mm ^ 2) / m;
Find: R -?
Decision:
Resistance formula: R = (p * L) / S, all values are given, we substitute them in the formula:
R = (0.15 * 0.4) / 0.5 = 0.06 / 0.5 = 0.12 Ohm;
Answer: wire resistance 0.12 ohms.
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