An insulator
plastic
No.
A very poor one.
A dielectric material is a substance that is a poor conductor of electricity, but an efficient supporter of electrostatic fields
A Conductor
plastic
No.
Yes, it is a horrible conductor of energy.
Both Electricity and Heat are forms of energy. If an element were a poor conductor of both it would simply mean that particular element was a poor conductor of energy.
That is called an insulator.
dry wood
An insulator is a poor conductor of energy. For example; Rubber is a poor conductor of electricity Rock is a poor conductor of heat A sponge is a poor conductor of sound.
An insulating material such as rubber.
Energy
nonmetal
A Conductor
A Conductor