Physics Circuit HELP!?
A Tungsten wire is 15.0 m long and has a 0.12 mm diameter. What is the resistance of this wire during room temperature?
--- Thanks in advance!
- Anonymous7 years agoFavorite Answer
Resistivity of Tungsten = 5.6x10^-8 ohm m
Resistance = Resistivity * ( length / cross sectional area)
Cross sectional area = pi(r^2) = pi (1.2 * 10^-4)^2 = 4.5 * 10^-8
Resistance = 5.6x10^-8 * ( 15 / 4.5 * 10^-8) = 18.67ohm