An electrical insulator is a material that will not easily conduct an electric current. Typical materials used to make insulators include rubber, plastic and glass. In transformers and electric motors, varnish is used. Insulating gases such as Sulfur hexafluoride are used in some switches. Wires that carry electric currents are usually insulated so the electricity won't go where it shouldn't..
Insulators are made of various materials. Common materials are: glass, tapes, silicon, rubber, plastic, foams, oil, wood, dry cotton, quartz, ceramic, etc. 
The type of insulator will depend on the uses. Insulators have high resistivity and low conductivity. The insulators protect the loss of current and make the current more efficient by concentrating the flow. 
Types of Insulator[change | change source]
Electric power transmission uses hree types of overhead insulator: pin insulator, suspension insulator, and strain insulator.
- The pin insulator is the earliest developed insulator. Pin type insulators can have up to three parts, depending on the amount of voltage. 
- The suspension insulator is for voltages above 33KV. Multiple insulators are connected in series. 
- The strain insulator is the same as a suspension insulator but it is used horizontally, whereas the suspension insulator is used vertically. The strain insulator is used to relieve the line of excessive tension, which happens when there is dead end of the line or sharp curve. 
References[change | change source]
- "What is insulator?". http://www.ehow.com/info_8031301_insulators.html/. Retrieved 8 May 2015.
- "What are electrical insulators?". http://www.wisegeek.org/what-are-electrical-insulators.htm/. Retrieved 21 May 2015.
- "types of electrical insulator". http://www.electrical4u.com/types-of-electrical-insulator-overhead-insulator/. Retrieved 6 May 2015.
- "Types of insulators". http://electricalsinfo.blogspot.com/2012/09/types-of-insulators.html/. Retrieved 6 May 2015.[dead link]
- "Insulator". http://home.earthlink.net/~jimlux/hv/insulgas.htm/. Retrieved 7 May 2015.[dead link]