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.<br /><br />Without seeing the actual diagrams labeled a, b, c, and d, I can guide you on how to identify a series circuit:<br /><br />1. Look for a single continuous loop with no branches.<br />2. All components (such as resistors, bulbs, or batteries) should be connected one after another along this loop.<br />3. There should be no junctions where the current can split into different paths.<br /><br />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.