4. Which circuit diagram represents a series circuit? a. c. b. d.

To determine which circuit diagram represents a series circuit, we need to understand the characteristics of a series circuit. In a series circuit, components are connected end-to-end in a single path for the current to flow. This means that the same current flows through all components, and there is only one path for the current.Without seeing the actual diagrams labeled a, b, c, and d, I can guide you on how to identify a series circuit:1. Look for a single continuous loop with no branches.2. All components (such as resistors, bulbs, or batteries) should be connected one after another along this loop.3. There should be no junctions where the current can split into different paths.If you have access to the diagrams, look for these characteristics to identify the series circuit among them. If you can provide more details or describe the diagrams, I can assist further in identifying the correct option.