One of the most common rhetorical appeals that authors use to convince an audience of supporting a particular position is ethos. This is also known as an appeal to credibility. In this case, the speaker tells us that he has ample experience as a nurse. This means that, when it comes to talking about topics related to health, he most likely has enough experience to have an informed opinion. By appealing to his credibility and knowledge, the speaker encourages the reader to trust his opinion and support a particular position.