For ETR 113, prerequisite or corequisite is MTH 115. For ETR 114, prerequisite is ETR 113 and the prerequisite or corequisite is MTH 116. Studies D.C. and A.C. circuits, basic electrical components, instruments, network theorems, and techniques used to predict, analyze and measure electrical quantities. Lecture 3 hours. Laboratory 3 hours. Total 6 hours per week.