The ornamental design for an adjustableelectricalbed, as shown and described.
FIG. 1 shows a perspective view of the present design.
FIG. 2 shows a top view of the present design.
FIG. 3 shows a front view of the present design, which is symmetrical to the rear view of the present design.
FIG. 4 shows a right view of the present design, which is the same as the left view of the present design; and,
FIG. 5 is a perspective view showing the bed is in a folded condition.
The broken lines showing of structural feature is indeed for the purpose of illustrating non-claimed subject matter and forms no part of the claimed design.