The ornamental design for an electric ricecooker, as shown and described.
FIG. 1 is a front, top and right-side perspective view of an electric rice cooker showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a right-side view thereof;
FIG. 7 is a left-side view thereof; and,
FIG. 8 is a cross-sectional view taken along line A-A in FIG. 2.
The broken lines shown represent unclaimed subject matter of the electric rice cooker and form no part of the claimed design. The dot-dash broken lines define boundaries of the claimed design and form no part thereof.