ESA Certified Alarm Technician Practice Exam

The unit of resistance is measured in __________.

1. Volts

2. Amperes

3. Ohms

4. Watt-hours

The correct answer is: Ohms

The unit of resistance is measured in Ohms, which is represented by the Greek letter Omega (Ω). Resistance is a fundamental property in electrical circuits, quantifying how much a component opposes the flow of electric current. When a voltage is applied across a conductor, the resistance determines how much current will flow through it. Ohm's Law, which states that Voltage (V) = Current (I) × Resistance (R), underscores the relationship between these three electrical quantities. Understanding this relationship is vital for technicians working with electrical systems, as proper assessment of resistance is crucial in diagnosing and resolving issues within circuits. Other units mentioned, such as Volts, Amperes, and Watt-hours, measure different electrical properties: Volts measure electrical potential, Amperes measure current, and Watt-hours quantify energy consumption. Each serves its purpose, but only Ohms specifically pertains to the measurement of resistance.