Electrolysis Practice Exam

What type of current is primarily used in electrolysis?

1. Alternating current

2. Pulsating current

3. Direct current

4. Static current

The correct answer is: Direct current

The correct answer is direct current. In electrolysis, direct current is essential because it provides a consistent flow of electric charge in one direction, which is necessary for the chemical reactions that occur at the electrodes. During electrolysis, ions migrate to the electrodes where reduction and oxidation reactions take place, and this process requires a stable and unidirectional flow of electricity. Alternating current, on the other hand, periodically changes direction, which would hinder the effective movement of ions towards the electrodes and disrupt the electrochemical reactions needed for electrolysis. Pulsating current, while it shares characteristics of both AC and DC, can lead to varying current levels, making it inefficient for electrolysis. Static current does not flow at all, meaning it cannot facilitate the ionic movement necessary for any electrochemical process. Thus, direct current is the only option that fully supports the requirements of electrolysis.