Cathodic Protection Tester Practice Exam

What type of charge do electrons carry?

1. Positive charge

2. Neutral charge

3. Negative charge

4. Proton charge

The correct answer is: Negative charge

Electrons carry a negative charge. This fundamental property is a key aspect of atomic structure and electricity. The negative charge of an electron allows it to interact with positively charged protons, which reside in the nucleus of an atom. This interaction is crucial for the formation of chemical bonds and the overall behavior of matter. In the context of cathodic protection, understanding the nature of electron charge is essential. Cathodic protection relies on the flow of electrons to prevent corrosion in metals. By establishing a negative charge at the surface of the metal to be protected, electrons can flow from a sacrificial anode to the metal surface, effectively reducing the oxidation reactions that lead to corrosion. The other options presented do not accurately describe the charge of electrons. Electrons are not positively charged, neutral, or associated with protons in terms of charge; protons are positively charged particles that, along with neutrons (which are neutral), make up the atomic nucleus. Thus, the accurate representation of electrons as carrying a negative charge underpins many principles in physics and engineering, including the functioning of cathodic protection systems.