Cathodic Protection Tester Practice Exam

According to Ohm's Law, voltage is calculated by which of the following formulas?

1. I x R

2. R / I

3. V / R

4. R x I

The correct answer is: I x R

Voltage is calculated using the formula that states voltage equals current multiplied by resistance. This relationship is fundamental to electrical circuits and is represented mathematically as V = I x R, where V is the voltage, I is the current in amperes, and R is the resistance in ohms. Ohm's Law provides a crucial understanding of how voltage, current, and resistance interact within a circuit. When you increase the resistance in a circuit while keeping the current constant, the voltage across the circuit must increase to maintain the balance defined by the formula. Likewise, if you increase the current while the resistance stays the same, the voltage must also increase. This principle is widely used in various electrical and electronic applications, including cathodic protection systems, where maintaining proper voltage is essential for effective operation. Understanding this relationship aids in the examination and design of cathodic protection configurations, ensuring they function properly to mitigate corrosion.