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Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω). … Insulators: Materials that present high resistance and restrict the flow of electrons.

## What is electrical resistance and its unit?

The SI unit of electrical resistance is **the ohm (Ω)**, while electrical conductance is measured in siemens (S) (formerly called “mho”s and then represented by ℧). … All objects resist electrical current, except for superconductors, which have a resistance of zero.

## What is meant by electrical resistance of a conductor Class 10?

Resistance is defined as the property of a conductor **to resist the flow of charges through it**. The resistance of conductor is numerically given as the ratio of potential difference across its length to the current flowing through it.

## What is electrical resistance formula?

Resistance has units of ohms (Ω), related to volts and amperes by **1 Ω = 1 V/A**. There is a voltage or IR drop across a resistor, caused by the current flowing through it, given by V = IR.

## What causes electrical resistance?

**An electric current flows** when electrons move through a conductor, such as a metal wire. The moving electrons can collide with the ions in the metal. This makes it more difficult for the current to flow, and causes resistance.

## What do you mean by 1 ohm?

One ohm is **equal to the resistance of a conductor through** which a current of one ampere flows when a potential difference of one volt is applied to it.

## What is called specific resistance?

Specific resistance is defined as the resistance offered per unit length and unit cross-sectional area when a known amount of voltage is applied. The mathematical representation is as follows: **ρ=RAL**.

## What is current formula?

The current is the ratio of the potential difference and the resistance. It is represented as (I). The current formula is given as **I = V/R**. The SI unit of current is Ampere (Amp).