How long should you take a wire with a cross-sectional area of 0.4 mm ^ 2 so that its resistance
| May 13, 2021 | education
How long should you take a wire with a cross-sectional area of 0.4 mm ^ 2 so that its resistance is 19.2 ohms and a resistivity of 0.096.
As we know from the school physics curriculum, the resistance value of a conductor can be calculated if the following formula is used:
R = p * L / S, p is the resistivity, L is the length of the specified conductor, and S is, respectively, its cross-sectional area.
Let’s determine what value the length of our wire should be in order for the resistance to be 19.2 ohms under the conditions that are written in this problem:
19.2 = 0.096 * L / 0.4;
L = 19.2: 0.24;
L = 80.
Answer: 80 m.
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