Resistance is the measure of a material's opposition to the flow of electric current. It is measured in units called Ohms (Ω) using a multimeter or an ohmmeter.
The higher the resistance of a material, the lower its conductivity. This means that materials with high resistance are less able to conduct electric current compared to materials with low resistance.
The three main factors that can affect the resistance of a material are its length, cross-sectional area, and temperature. Longer materials, smaller cross-sectional areas, and higher temperatures tend to have higher resistance.
The resistance of a material can be calculated using Ohm's law, which states that resistance (R) is equal to the voltage (V) divided by the current (I). In equation form, it is written as R = V/I.
Determining the resistance of a material is important in understanding its electrical properties and how it can be used in circuits. It also allows for the calculation of other important parameters such as power and voltage drop in a circuit.
