Electrolysis Practice Exam

Which of the following does NOT produce direct current?

1. Battery

2. Solar panel

3. Dry cell

4. Fuel cell

The correct answer is: Solar panel

To determine which option does not produce direct current, it's important to understand how each of these energy sources functions. A solar panel, in basic operation, converts sunlight into electricity using photovoltaic cells, which produce direct current (DC) upon exposure to light. The other options, including batteries, dry cells, and fuel cells, all generate direct current as well. Specifically, a battery provides a stable source of DC, a dry cell is a type of battery that also outputs DC, and a fuel cell combines hydrogen and oxygen to produce electricity, resulting in direct current as well. Thus, the assertion that a solar panel does not produce direct current is incorrect because it actually does. All the mentioned sources, in fact, produce DC, making the premise of the question about identifying one that does not misleading.