Cathodic Protection Tester Practice Exam

In an electrical formula, which letter typically represents current?

1. C

2. I

3. E

4. V

The correct answer is: I

In electrical formulas, the letter that typically represents current is "I." This convention stems from the use of "I" representing electric current in honor of the French physicist André-Marie Ampère, who made significant contributions to the field of electromagnetism. This representation is now a standard in electrical engineering and physics, where "I" is commonly used in equations related to Ohm's Law and other electrical principles. For instance, in Ohm’s Law, the formula is expressed as V = I × R (where V is voltage, I is current, and R is resistance). This helps maintain a uniform language across various equations and applications within the field. The other letters in the options have different meanings: "C" is often used for capacitance, "E" can represent electromotive force (or voltage, depending on context), and "V" is typically used for voltage. Therefore, "I" distinctly identifies electric current, solidifying its role within electrical formulas.