A noun is a word that names something: either a person, place, or thing. In a sentence, nouns can play the role of subject, direct object, indirect object, subject complement, object complement, appositive, or adjective.
Hello. Unfortunately it was not possible to find the text to which your question refers. However, I will try to help you in the best possible way.
The text must present the fact that many medical devices are energy dependent to function and many people need these devices to be always working to keep them in good health and even keep them alive. In that case, power outages are very serious problems for people who depend on these devices. In that case, to answer your question, you would need to find the sentence that addresses that information.
