What are good insulators and conductors in a kitchen?

Insulators are usually plastics, and conductors are usually metal.

for electricity:
Insulators:
Bowl (plastic), tupperware containers, plastic utensils, formica or granite countertop, plastic microwave or oven handle, spatulas, stone-sinks

Conductors:
egg beaters/whisk, metal knives, metal flippers for burgers, sink faucet, metal bowls, metal utensils (silverware)

for heat:
insulators: plastics, porous items (*sponges), -your entire refrigerator-
conductor: metals, stone countertops, glass (the glass measuring cups come to mind, the ones you put boiling water in)