GE JCB830 Owner's Manual page 9

The following information will help you choose cookware which will give good performance on glass cooktops.
a straight edge.
Pans with rounded, curved, ridged or
warped bottoms are not recommended.
The following information will help you choose cookware which will give good performance on coil cooktops.
1"
Not over 1 inch
Stainless Steel:
recommended
Aluminum:
heavy weight recommended
Copper Bottom:
recommended
Porcelain Enamel-Covered CastIron:
recommended
Surface Cookware Tips
Use medium- or heavy-weight cookware.
Aluminum cookware conducts heat faster
than other metals. Cast-iron and coated
cast-iron cookware are slow to absorb
heat, but generally cook evenly at low to
medium heat settings. Steel pans may
cook unevenly if not combined with other
metals.
Wok Cooking
We recommend that you use only a flat-
bottomed wok. They are available at your
local retail store.
Do not use woks that have support rings.
Use of these types of woks, with or
without the ring in place, can be dangerous.
Glass-Ceramic:
usable, but not recommended
Stoneware:
usable, but not recommended
Home Canning Tips:
For best cooking results, pans should be
flat on the bottom. Match the size of the
saucepan to the size of the surface unit.
The pan should not extend over the edge
of the surface unit more than 2.5 cm
1 inch.
Placing the ring over the surface unit will
cause a buildup of heat that will damage
the porcelain cooktop. Do not try to use
such woks without the ring. You could
be seriously burned if the wok tips over.