anonymous one year ago A coil annealed copper wire has 820 turns, the average of which is 9 in. If the diameter of the wire is 32 mils, calculate the total resistance of the coil at 20 degree Celsius.

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1. Michele_Laino

Hint: here we have to apply the subsequent formula: $\Large R = \rho \frac{l}{s}$ where R is the requested resistance, l, is the total length of the coil, and s is the cross sectional area of the coil

2. Michele_Laino

$\rho$ is the specific resistivity, which depends on the temperature of the coil