Practicing Success
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A coil of wire has a resistance of $25\Omega$ at 20°C and a resistance of resistance of $25.17\Omega$ at 35°C. What is its temperature coefficient of resistance? |
$4.5 \times 10^{-4} °C^{-1}$ $5 \times 10^{-4} °C^{-1}$ $0.5 \times 10^{-4} °C^{-1}$ $4 \times 10^{-4} °C^{-1}$ |
$4.5 \times 10^{-4} °C^{-1}$ |
$\alpha = \frac{\Delta R}{R\Delta T} = \frac{0.17}{25\times 15} = 4.5\times 10^{-4}°C^{-1}$ |
