**Contents**show

## What is a material that has no electrical resistance?

**superconductor**. A material that has no electrical resistance.

## Is there a material with no resistance?

Superconductors conduct electricity with zero resistance, and so can lead to more efficient power lines. … (Power companies typically lose about 7 percent of their energy to heat caused by resistance in transmission wires.)

## What conductor has no resistance?

Properties of **perfect conductors**

**Perfect conductors**: have exactly zero electrical resistance – a steady current within a perfect conductor will flow without losing energy to resistance. Resistance is what causes heating in conductors, thus a perfect conductor will generate no heat.

## Do all objects have electrical resistance?

**All materials have some resistance**, but certain materials resist the flow of electric current more or less than other materials do. Materials such as plastics have high resistance to electric current. … They are called electric conductors. A wide wire has less resistance than a narrow wire of the same material.

## Does electricity flow through an open circuit?

In the open circuit the current can not flow from one end of the power source to the other. Because of this **there is no current flow**, and therefore the light does not turn on.

## Why does a superconductor have zero resistance?

One can visualize that all electrons on the Fermi-surface having opposite spin from those cooper pairs. Thus the superconducting state is an ordered state of the conduction electrons. **The scattering on the lattice atoms is eliminated**, thus causing a zero resistance.

## Which is directly proportional to the resistance?

The resistance of a wire is directly **proportional to its length** and inversely proportional to its cross-sectional area. Resistance also depends on the material of the conductor. … The resistance of a conductor, or circuit element, generally increases with increasing temperature.

## At what temperature does the resistance of very pure mercury become almost zero?

Answer: **about -269°C**, the resistance of mercury drops to Zero!

## Are superconductors perfect?

Superconductivity is a phenomenon occurring in real life, while perfect conductivity is an assumption made to ease the calculations. Perfect Conductors can have any temperature, but superconductors **only exist below the critical temperature of the material**.

## What resistance does a good electrical conductor have?

The resistivity of an exceedingly good electrical conductor, such as hard-drawn copper, at 20° C (68° F) is **1.77 × 10 ^{–}^{8} ohm-metre**, or 1.77 × 10

^{–}

^{6}ohm-centimetre. At the other extreme, electrical insulators have resistivities in the range 10

^{1}

^{2}to 10

^{2}

^{}ohm-metres.