69-Those substances which have extremely high resistance are called as.....1 pointAmetreInsulatorConductorsCurrent

Break Down the Problem

1. Identify the key characteristics of substances that exhibit high resistance.
2. Determine which options provided fit this description.

Relevant Concepts

• Conductors are materials that allow the flow of electricity with low resistance.
• Insulators are materials that do not allow the flow of electricity, characterized by extremely high resistance.
• Ametre is a unit of measurement and not relevant in this context.
• Current refers to the flow of electric charge, also not relevant.

Analysis and Detail

1. Ametre: Not applicable, as it is not a type of substance.
2. Insulator: This fits the definition provided, as insulators have very high resistance.
3. Conductors: This describes materials with low resistance.
4. Current: This term refers to the actual flow of electricity and does not describe a substance.

Verify and Summarize

Out of the given options, only "Insulator" directly describes a substance with extremely high resistance.

Final Answer

The substances which have extremely high resistance are called Insulators.