4 points
The headlights of an automobile have an average resistance of 24 2. The
potential difference of an automobile battery is 12 V. What is the intensity
of the current flowing in the headlights ? *

Carbon is allowed to diffuse through a steel plate 15 mm thick. the concentrations of carbon at the two faces are 0.65 and 0.30 kg c/m^3 fe, which are maintained constant. if the preexponential and activation energy are 6.2 x 10-7 m2 /s and 80,000 j/mol, respectively, compute the temperature at which the diffusion flux is 1.43 x 10^-9 kg/m^2 -s.