the resist ivory of gold is 2.44*10^-8 ohm*m at a temperature of 20 degrees Cels
ID: 1496927 • Letter: T
Question
the resist ivory of gold is 2.44*10^-8 ohm*m at a temperature of 20 degrees Celsius. a gold wire, 0.5 mm in diameter and 44 cm long, carries a current of 380ma. the number of electrons per second passion a given cross section of wire, is closest to_____ the resist ivory of gold is 2.44*10^-8 ohm*m at a temperature of 20 degrees Celsius. a gold wire, 0.5 mm in diameter and 44 cm long, carries a current of 380ma. the number of electrons per second passion a given cross section of wire, is closest to_____ the resist ivory of gold is 2.44*10^-8 ohm*m at a temperature of 20 degrees Celsius. a gold wire, 0.5 mm in diameter and 44 cm long, carries a current of 380ma. the number of electrons per second passion a given cross section of wire, is closest to_____Explanation / Answer
Resistance R of a wire of length L, cross sectional area A and resistivity S is given by:
R = S * L/A
You need to be consistent with units, which means L must be in metres and A in m^2
radius of wire = 0.0005/2 = 2.5*10^-4m
A = pi * r^2 = 1.96 * 10^-7 m^2
L = 0.44 m
R = 2.44 * 10^-8 * 0.44/1.96 *10^-7 = 0.0547 ohms
Current I = 0.380 A
Power = I^2 * R
= 7.89 * 10^-3 W,
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