An insulator is a material that does not conduct electricity. More specifically, it is a material that is chosen to prevent electricity passing from one point to another. Typical examples are the plastic covering on cables, plastic cases around electronic circuits and the body of circuit boards which support copper tracks but keep them isolated from each other.
To protect something from electrical current.
Either of these might be used. "Which" is the better choice if you are supposed to choose from a limited set of cups (this metal cup or this thin ceramic cup or this thick ceramic cup). If you mean the choice of all existing cups, you might "what cup" or more appropriately "what kind of cup."
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A lack thereof is best. A vacum does not transfer heat.
Yes. There's no material known that insulates against gravity.
To protect something from electrical current.
Here are some sentences.This fiber insulates the roof.The quilt insulates you from the cold.
One who, or that which, insulates., The substance or body that insulates; a nonconductor.
Myelin Sheath is the structure that insulates most part of neuron
It insulates the fish from the cold air above.
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It insulates you
Paper
The insulating layer
insulates
asbestos
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