Resistance
Resistance is the property of a material or component that opposes the flow of electric current through it. It is measured in Ohms and denoted by the symbol “Ω”.
Resistance arises due to the interactions between electrons and the atoms or molecules that make up the material. When an electric current flows through a material, the electrons collide with these atoms or molecules, causing the electrons to lose energy and reducing the flow of current.
The resistance of a material depends on several factors, including its length, cross-sectional area, and the material’s resistivity, which is a measure of how strongly the material opposes the flow of current. Some materials, such as metals, have low resistance and are good conductors of electricity, while other materials, such as rubber or glass, have high resistance and are insulators.
Resistance and Conductance
Resistance and conductance are two related properties of a material that describe its ability to conduct electricity. Resistance is the property of a material that opposes the flow of electric current through it, while conductance is the property that allows electric current to flow easily through a material.
Resistance is measured in Ohms (Ω) and is the inverse of conductance, which is measured in Siemens (S). Conductance is the reciprocal of resistance, meaning that the conductance of a material is equal to 1 divided by its resistance.
In other words, a material with high resistance will have low conductance, while a material with low resistance will have high conductance. Materials with high conductance are good conductors of electricity, while materials with low conductance are poor conductors or insulators.
Conductance and resistance are related by Ohm’s Law, which states that the current flowing through a conductor is directly proportional to the voltage applied across it, and inversely proportional to its resistance. This means that if the voltage applied across a material is increased, the current flowing through it will also increase, assuming its resistance remains constant. Conversely, if the resistance of a material is increased, the current flowing through it will decrease, assuming the voltage applied across it remains constant.
