CompTIA Network+ Practice Test

What describes the function of an Uninterruptible Power Supply (UPS)?

1. Long-term power backup

2. Short-term backup power

3. Provides only protection from surges

4. Used only for data centers

The correct answer is: Short-term backup power

An Uninterruptible Power Supply (UPS) primarily serves the function of providing short-term backup power during outages or when there are voltage fluctuations in the electrical supply. This is essential for maintaining operations during brief interruptions, which can occur for various reasons, such as power loss or equipment failure in the electrical grid. By supplying power for a limited duration, a UPS allows users to save their work, shut down equipment safely, or continue operation until a generator kicks in if one is available. This immediate power availability is crucial for preventing data loss and protecting sensitive electronic equipment from damage caused by power outages. The other choices presented do not accurately represent the primary function of a UPS. For instance, while a UPS can offer protection from surges, it is not designed solely for that purpose. Additionally, it is applicable beyond just data centers and can be used in various environments such as offices and homes to protect critical devices. Lastly, it is not typically meant for long-term power backup, which is more characteristic of generators and other solutions designed for prolonged outages.