The relationship between diameter and resistance is inverse, meaning that as the diameter of a material increases, the resistance decreases. This is because a larger diameter allows for more space for electrons to flow, resulting in less resistance to the flow of electricity.
The longer a material is, the higher its resistance will be. This is because a longer material has more atoms, which creates more obstacles for electrons to pass through, resulting in higher resistance.
Resistance is measured in ohms (Ω). This unit is named after the German physicist Georg Ohm, who discovered the relationship between voltage, current, and resistance.
As temperature increases, so does the resistance of a material. This is because as temperature rises, the atoms in the material vibrate more, creating more obstacles for electrons to flow through, resulting in higher resistance.
The formula for calculating resistance is R = V/I, where R is resistance in ohms, V is voltage in volts, and I is current in amperes. This formula is known as Ohm's law and is used to determine the resistance of a material based on its voltage and current.