Which action sequence best represents an algorithm?

The sequence that best represents an algorithm is the one involving shaking the bulb and checking if it rattles to determine if it needs replacing. This option outlines a specific series of steps that lead to a decision or outcome based on conditions.

Algorithms are defined as precise sets of rules or instructions designed to perform a task or solve a problem step-by-step. In this case, the action to “shake the bulb” is followed by an evaluation of the condition—the rattling sound—which guides the next step (i.e., replacing the bulb if it rattles). This reflects the systematic and logical nature of algorithms, where each action is dependent on the result of the previous one.

The other options represent simpler actions or singular tasks rather than sequences with conditional logic leading to outcomes, which are essential characteristics of an algorithm. For example, simply screwing in a lightbulb or measuring electricity are standalone actions without the decision-making process involved. Checking the power source might also be a part of troubleshooting, but it does not inherently provide a sequence of actions based on a condition that guides to a specific result.