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Q. Define Resistance
In physics, resistance describes the opposition that any physical object encounters as it moves through a given medium. In the context of electricity and electronics, resistance is an electrical property of a material that limits the flow of electrons by interacting with them in such a way as to make them slow down or stop.
The electricity running through your home has high levels of resistance. So much resistance that you could not even feel any of its effects.
Any material with low resistance levels allows electrical current to pass through easily and can be said to be a good conductor (see below). Any material with high resistance levels will not allow electricity to pass through easily and can be said to have high resistivity.
Resistance is an energy-wasting process. It converts electrical energy into heat, losing some power in electromagnetic radiation.
Resistance is denoted by ‘R.’
The formula of Resistance is
R = V/I,
where V is the potential difference, and I is current.
The SI unit of resistance is Ohm.
The “electrical” resistance of a material measures its opposition to the flow of electric current. Protected conductors or cables have an insulating cover that impedes the flow of electrons, thereby increasing the resistance and lowering the current compared to what it would be with no cover present.
