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To form a center tap (CT), at least two coils must be formed. This increases the number of steps in the winding process and decreases the workability. To prevent this, a conductor having a plurality of plate portions that are connected to each other at one vertex of a rectangular shape is formed. Th

To form a center tap (CT), at least two coils must be formed. This increases the number of steps in the winding process and decreases the workability. To prevent this, a conductor having a plurality of plate portions that are connected to each other at one vertex of a rectangular shape is formed. The conductor is wound on a winding shaft, thus forming two coils.

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What is claimed is: 1. An electrical device comprising: a conductor in which a plurality of plate portions are connected to each other at portions thereof, wherein at least two plate portions are formed into coils by winding said plate portions around a winding core, said plate portions to be conne

What is claimed is: 1. An electrical device comprising: a conductor in which a plurality of plate portions are connected to each other at portions thereof, wherein at least two plate portions are formed into coils by winding said plate portions around a winding core, said plate portions to be connected to each other are arranged point-symmetrically about a connecting portion thereof, said conductor has plural terminals in positions that protrude from an area of said plate portions that is wound around the winding core, and said conductor except for the plural terminals is insulated by an insulating material layer; and an electric wire which is wound around said conductor formed into coils as a winding insulated from said conductor by the insulating material layer. 2. The device according to claim 1, wherein the connecting portion of said plate portions is utilized as a tap of said coils. 3. The device according to claim 1, wherein the connecting portion of said plate portions is utilized as a center tap of a transformer. 4. The device according to claim 1, wherein each of said plate portions has a laminated structure of a conductor and insulator. 5. The device according to claim 1, wherein each of said plate portions has at least one electrode at a position thereof corresponding to a vicinity of a center of said coils. 6. The device according to claim 1, wherein each of said plate portions has at least one electrode at a position thereof corresponding to an end of a corresponding one of said coils and a vicinity of a center of said coils. 7. A method of producing an electrical device, said method comprising steps of: forming a conductor in which a plurality of plate portions are connected to each other at portions thereof, wherein the conductor has plural terminals; covering the conductor except for the plural terminals with an insulating material; forming at least two plate portions of the conductor into coils by winding the plate portions around a winding core such that the plural terminals protrude from an area of the plate portions that is wound around the winding core, wherein the plate portions to be connected to each other are arranged point-symmetrically about a connecting portion thereof; and winding an electric wire around the conductor formed into coils as a winding insulated from the conductor by the insulating material.