Question14. 17. Find the temperature coefficient of resistance of iron at $20^{\circ} \mathrm{C}$, if iron has an inferred zero resistance temperature $-162^{\circ} \mathrm{C}$ ? Ans $0,00551 /{ }^{\circ} \mathrm{C}-$

Studdy Solution
Solve for the temperature coefficient of resistance ($\alpha$).
Simplify the expression: $\alpha = \frac{1}{20 + 162}$ $\alpha = \frac{1}{182}$
Calculate the value: $\alpha \approx 0.00549 /{ }^{\circ} \mathrm{C}$
The temperature coefficient of resistance of iron at $20^{\circ} \mathrm{C}$ is approximately $0.00549 /{ }^{\circ} \mathrm{C}$.
Note: The provided answer $0.00551 /{ }^{\circ} \mathrm{C}$ might be due to rounding differences.