What is resistance in electric current?

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). … All materials resist current flow to some degree.

What is resistance and its formula?

The resistance formula is as follows: Resistance = voltage drop across a resistor/ current flowing through a resistor. R = frac{V}{I} R = resistance (Ohms, Ω)

What is resistance and its unit?

Resistance is the hindrance offered by an object to the flow of current through it. … SI unit of resistance is Ohm (Ω). It is resistance offered by an object when 1 volt potential difference is applied across it and 1 Ampere of current passes through it.

What is resistance in a circuit?

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). … All materials resist current flow to some degree.

What is resistance and example?

Resistance is defined as a refusal to give in or to something that slows down or prevents something. An example of resistance is a child fighting against her kidnapper. An example of resistance is wind against the wings of a plane.

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What is difference between resistance and resistivity?

Resistance is defined as the property of the conductor which opposes the flow of electric current. … Resistivity is defined as the resistance offered by the material per unit length for unit cross-section.

What is CBSE 10th resistivity?

Resistivity is defined as the electrical resistance of a conductor of unit cross-sectional area and unit length. The resistance of any conductor is directly proportional to the length of the conductor and inversely proportional to the area of cross-section of the conductor.

What is resistance of a conductor?

Conductor resistance is a property of a conductor at a specific temperature, and it is defined as the amount of opposition there is to the flow of electric current through a conducting medium.

Why resistance is used?

In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.

What causes resistance?

Resistance occurs because moving electrons in current bump into atoms of matter. Resistance reduces the amount of electrical energy that is transferred through matter. That’s because some of the electrical energy is absorbed by the atoms and changed to other forms of energy, such as heat.

What is resistance and its uses?

We know that one of the main uses of resistor is to control the flow of current. … If a resistor is said to have high resistance then it means less current flows in it for the given voltage. Some applications and uses of resistor are listed below: Circuit functions. Dividing voltage.

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What causes electric 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 is resistance in electricity Class 10?

Resistance: Resistance is a property of conductor due to which it resists the flow of electric current through it. A component that is used to resist the flow of electric current in a circuit is called a resistor. In practical application, resistors are used to increase or decrease the electric current.

Why is there resistance in a circuit?

The electrons do not flow freely through the circuit as the material they move through creates a restriction to the electron flow. This restriction is called resistance.