A 100 m length of Nichrome wire has a diameter of 075 mm Wha

A 100 m length of Nichrome wire has a diameter of 0.75 mm. What current nows through this wire when connected to a 12 V battery? (rho_nichrome = 1.5 times 10^-6 ohmm)

Solution

we know that

R = pl/A

= 1.5*(10^-6)*1004/(pi*0.00075*0.00075)

= 852.221

I = V/R = 12/852.221 = 0.014 A Answer