What are substances that resist the flow of electricity?

Answer 1

Bio-diesel

Answer 2

Important note

If insulators are allowed to get wet, the water on their surfaces can easily destroy the insulation effect. For that reason design engineers must take adequate precautions to prevent an insulator from getting damp or wet.

Examples: double-insulated household appliances and electrical apparatus that is enclosed by watertight protective boxes for vehicles, boats, aircraft, etc.

If an insulator cannot be prevented from getting damp or wet, the operating conditions must be so arranged that the water is not subjected to a high enough voltage to make the water conduct.

Examples: high-voltage electricity power lines, which are open to the weather (rain, snow, etc.) are carried by ceramic insulators which have long surface lengths. The length of the insulators is designed to match the voltage of the lines so that any water on their surfaces won't cause catastrophic short circuits of current to the grounded towers which support the insulators.

Insulators such as dry wood, plastic and rubber resist the flow of electricity.

Answer 3

For a material of given length and cross-sectional area, its resistivity, expressed in ohm-metres, is the property which opposes current.

Answer 4

Resistance in a DC circuit.

In an AC circuit the opposition to current flow is impedance, and can be exhibited by resistors, capacitors and inductors.

Answer 5

The tendency of a material to oppose the flow of electrons is called resistivity or resistance. The resistance of an opposing material is usually measured in ohms.

Answer 6

resistance

Answer 7

Resistance

Answer 8

resistance

Answer 9

conductors