Why is electrical resistance important?
Resistance is another important property that can be measured in electrical systems. Resistance is measured in units called ohms. … Materials with low resistance let electricity flow easily. Materials with higher resistance require more voltage (EMF) to make the electricity flow.
What is an example of a resistance?
The act or an instance of resisting or the capacity to resist. 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.
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 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.
How do you get rid of electrical resistance?
Of course there exist many different ways to reduce the resistance, such as using a thicker wire (increase the cross section area), lowering the temperature, or even changing the material.