The changes in the electrical resistivity of metals at 78°K with elongation are investigated. Part I is devoted to the changes introduced in the face‐centered cubic metal aluminum upon elongation at 78°K. Part II discusses the changes that occur in the body‐centered cubic metal molybdenum upon elongation at 298°K. Both sections describe the relationship between the portion of the resistivity generally attributed to point defects and the resistivity that remains after the point defect recovery has been completed; these resistivities are proportional to each other for both metals.It is noted that for both metals the resistivity caused by point defects and the residual resistivity are directly proportional to the elongation. It is further discovered that the rate of resistivity recovery at 145°C for cold‐worked molybdenum is directly proportional to the amount of elongation introduced.