When the refrigerator door or pivotal part 20 is mounted to the refrigerator main body 10 by the hinge device 12, a portion of the first coil 11 completely passes through the second coil 21, and the first coil 11 is overlapped with the second coil 21 at a position thereof in the pivot axis of the hinge device 12, thereby generating electromagnetic coupling therebetween. When the refrigerator door is opened or closed, the second coil 21 is pivoted relative to the first coil 11, and a relative position of the first coil 11 and the second coil 21 in the pivot axis remains unchanged throughout the pivoting movement, so that the power may be supplied between the first coil 11 and the second coil 21 in a wireless manner. In an embodiment, the power may be transmitted from the refrigerator main body 10 to the refrigerator door or pivoting part 20, and then the power may be supplied to a load, such as a display device, on the pivoting part 20 via an electric wire 24 provided on the second coil 21 and shown in FIGS. 4, 6, and 8.

An electrical apparatus according to another embodiment, as shown in FIGS. 9-12, comprises a main body 110, a pivotal part 120, a first coil 111, and a second coil 121. The first coil 111 at least partly passes through the second coil 121 to form electromagnetic coupling between the first coil 111 and the second coil 121, so that power is wirelessly supplied between the main body 110 and the pivotal part 120.