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static electricity
insulators do not allow electricity to pass through them whereas conductors allow electricity to pass through them.
All metals for example iron, copper, nickel. They are called conductors. Plastics and other elements do not, only metals. They allow electricity to pass through them because they have free electrons
An object that does not allow electricity to flow through easily is an insulator. It is so hard that it often won't go through at all. Sometimes you find an exception, like lightening. There is nothing that electricity cannot flow through altogether.
Such materials are called insulators. Examples include dry wood, ceramics, plastic. No material allows absolutely no electricity to pass through; the so-called insulators simply have a very high electrical resistance, so they only allow a small, usually insignificant, amount of current to pass.
Sound is a pressure wave. Objects that "allow" sound to travel through them could be called wave guides.
static electricity
A material that does not conduct (or allow the 'passage' of) electricity is called an "insulator".
Objects that let all light through are called transparent objects, like glass windows. Objects that only let some light through are called translucent, like a lamp shade, or a curtain. Objects that don't let any light through are called opaque, like a desk.
electricity
insulators do not allow electricity to pass through them whereas conductors allow electricity to pass through them.
All metals for example iron, copper, nickel. They are called conductors. Plastics and other elements do not, only metals. They allow electricity to pass through them because they have free electrons
No electricity
Insulators - they cannot allow electricity to flow through them as they have no mobile charge carriers present. Insulators - they cannot allow electricity to flow through them as they have no mobile charge carriers present.
rubber would be an example of something that does not allow electricity to move through it easily
banana
opaque objects