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Silence used in a speech is referred to as a pause. There is a lot of power in a pause.
To get the audience’s attention stop speaking and gaze at the audience. This will get their attention because they will assume something important is going to follow.
A pause will let a powerful statement ‘sink in’. For example, if you are talking about a presidential candidate who is failing the nation, you can make the statement and pause. Then dive into your speech.
A pause is used after asking for audience audience participation. It generates activity among the audience because people will feel obligated to act and volunteer. This will influence others to do the same.