Cathodic Protection Tester Practice Exam

What device is used to increase or decrease voltage levels?

1. Capacitor

2. Inductor

3. Resistor

4. Transformer

The correct answer is: Transformer

The correct choice is a transformer, which is specifically designed to alter voltage levels in an electrical circuit. A transformer operates on the principle of electromagnetic induction, allowing it to either step up (increase) or step down (decrease) voltage. It consists of two coils of wire, known as the primary and secondary windings, wrapped around a core. When alternating current flows through the primary winding, it creates a magnetic field that induces a voltage in the secondary winding, with the ratio of turns in the primary and secondary coils determining the change in voltage. Understanding the function of transformers is crucial in power distribution and electrical engineering, as they ensure that electricity can be transmitted efficiently over long distances, utilizing high voltages to reduce energy loss from heat due to resistance. In practice, transformers are used in various applications, from power distribution networks to small electronics, making them essential devices in managing voltage levels effectively.