Motors, transformers, etc. It is necessary to establish a magnetic field before energy conversion, and some electrical appliances need to establish an electric field before energy conversion. The electric energy needed to establish magnetic field and electric field is reactive energy. The electric meter that records this kind of electric energy is the reactive energy meter. Reactive power does not consume energy in the electrical equipment itself, but it will produce reactive current in the electrical circuit, resulting in a certain loss in the circuit. Reactive power meter is specially used to record this kind of loss, and it is generally installed only by larger power users.