The electricity meter in terms of electrical engineering is a coil 2. It is included in the wiring so that one coil is connected in series with a load, it comprises several thick wire turns and has a very low resistance. Flows through it the same current as in the load, so it is called the coil current. The second coil in the meter has contains a lot of turns and is connected parallel to the load, the current through it is very small, and the voltage is the same as the load. It is called the coil voltage.
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With this inclusion, magnetic fields generated by these coils have a phase shift of 90 degrees relative to each other. These coils are geometrically arranged in the housing of the counter, so that their fields are acting on the counter disk, forcing it to rotate. Disc rotation speed is directly proportional to load power. A direction of rotation depends on the direction of the current in the coils. For clarity, we assume a positive phase shift when the disk is spinning forward.