A substance that is a poor conductor of electricity. In other words, it has a high resistance to the flow of electrons. Part of the conductor, semiconductor, insulator troika.

Printed-circuit boards must be good insulators for fairly obvious reasons. Insulators are commonly seen on telephone poles. The biggest are seen hanging from the arms of high-tension or high-voltage towers, where they keep the current going through the wires from leaking through the tower to ground.

In"su*la`tor (?), n.

1.

One who, or that which, insulates.

2. Elec. & Thermotics

The substance or body that insulates; a nonconductor.

 

© Webster 1913.

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