Cathodic Protection Tester Practice Exam

Resistance in an electrical circuit is measured in:

1. Volts (V)

2. Amperes (A)

3. Ohms (Ω)

4. Watts (W)

The correct answer is: Ohms (Ω)

Resistance in an electrical circuit is measured in Ohms (Ω). This unit is named after Georg Simon Ohm, a German physicist who formulated Ohm's Law, which defines the relationship between voltage, current, and resistance in an electrical circuit. According to Ohm's Law, the resistance in a circuit can be calculated by the formula R = V/I, where R stands for resistance in ohms, V represents voltage in volts, and I denotes current in amperes. Ohms provide a measure of how much a material resists the flow of electric current. In practical applications, understanding resistance is essential for designing circuits and systems, especially in fields like cathodic protection, where controlling electrical currents is vital for preventing corrosion. Other units mentioned serve different purposes: volts (V) measure electric potential, amperes (A) denote the flow rate of electric charge, and watts (W) measure electrical power. Each plays a unique role in electrical calculations but does not convey resistance directly.