How do i get started with this problem: Nichrome wire of a cross-sectional radiu

Question

How do i get started with this problem: Nichrome wire of a cross-sectional radius of 0.791mm is to beused in winding a heating coil. If the coil must carry acurrent of 9.25 A when a voltage of 1.20E2 V is applied across itsends, find (a) the required resistance of the coil and (b) thelength of the wire you must use to wind the coil. How do i get started with this problem: Nichrome wire of a cross-sectional radius of 0.791mm is to beused in winding a heating coil. If the coil must carry acurrent of 9.25 A when a voltage of 1.20E2 V is applied across itsends, find (a) the required resistance of the coil and (b) thelength of the wire you must use to wind the coil.

Explanation / Answer

radius R = 0.791 mm             = 0.791 * 10 ^ -3 m cross sectional area A = R 2 current i = 9.25 A voltage V = 120 V (a). resistance of the coil R = V / i (b).we know R = L / A from this length of the coil L = RA / where = resistivity of the nichrome ( specificresistance of the nochrome ) substitue values weget answer current i = 9.25 A voltage V = 120 V (a). resistance of the coil R = V / i (b).we know R = L / A from this length of the coil L = RA / where = resistivity of the nichrome ( specificresistance of the nochrome ) substitue values weget answer

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