Appliance - A device alway consuming energy delivering a function not a changed condition (often connected via a plug: television, laptop, ... but also more fixed large devices like an elevator).
Carrier - A confined amount of matter carrying energy enabling transformation, conversion and storage of energy. Sometimes represented virtually ny contract.
Transformer - A transformer is primarily a logistic node in an E-Network of one energy form. Changing the range of the quantity (like from high to low voltage, from high to low temperature etc.). However it also has some "conversion aspect" since the transformation is typically driven by electricity or heat which can influence the output energy in the prinary system.
Weather - The weather is (implicitly) considered as a global Infusor/E-Consumer or Extractor/E-Producer depending on the actual weather conditions and the conditions of the areas/conditioned spaces effected. By relating the weather to a geospatial areas we know which conditioned spaces are effected by which weather.