To emanate is to come out from a source and spread. A smell can emanate from a kitchen, light from a door left open, heat from stones in the sun. People also use it for a quality: calm or confidence can emanate from someone, as if it were flowing off them. You will usually hear emanate from for the source. It is a fairly formal verb. In ordinary talk, give off, come from, or just smell of do the same job. Though actually, writers like emanate because one shape of sentence can cover real things (light, smell) and feelings (authority, kindness). For a kitchen smell, most people still say it smells of bread.