Formulas in physics are mathematical expressions of natural laws or principals well established. The two most important for the ordinary citizen are first the one that gives expression to Ohm's law and second, the one that shows how to calculate the power of a current.
©1932 by Iowa State Teachers College
"Two Fundamental Equations of Current Electricity,"
Science Bulletin: Vol. 4:
6, Article 8.
Available at: https://scholarworks.uni.edu/science_bulletin/vol4/iss6/8