Chat with our AI personalities
The letter "I" is normally used for direct current, or for the average current in the case of AC. The lower-case version, "i", is used for the instantaneous current, in the case of AC.
Algebra is a part of mathematics in which letters and other symbols are used to represent numbers and quantities in formulas and equations.
In mathematical equations letters of the alphabet are used to represent numbers. Letters in the beginning of the alphabet, a, b, c...,etc typically represent Constants. Letters at the end, x, y, z..typically represent Unknowns, or variables.
Variable: A letter or symbol used to represent a number or quantities that vary
The letters b and c could represent almost any number. They are used in equations normally because they are unknown, and so that we can figure out their values through solving the problem.