electrical properties a level physics please help!!?
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The heating element of a hairdryer is made of coiled nichrome wire. the diameter of the wire is 0.46mm and the length of the wire is 7.3meters. calculate the resistance of the element at 0 centigrade. the resistivity of nichrome is 110 x 10(to the power of minus 8).
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Verified answer
R = rho µohm/100 x l m /Smm2
S = pi d^2 /4 = 3.14159 x 0.46^2 x/4 = 0.166 mm2
R = 1.1/100 x 7.3 /0.166 = 0.4873 ohm
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