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… too many 0s in your 2mm ! Resistance is the measure of how difficult it is for electricity to flow through a material. It is measured in ohms (Ω) and is represented by the symbol R.
The formula for calculating resistance is R = V/I, where R is the resistance in ohms, V is the voltage in volts, and I is the current in amps.
The factors that affect resistance include the material of the object, its length, its cross-sectional area, and its temperature. Materials with higher resistance, longer lengths, smaller cross-sectional areas, and higher temperatures will have higher resistance.
In a series circuit, the total resistance is the sum of each individual resistance. In a parallel circuit, the total resistance is less than the smallest individual resistance. This is because in a parallel circuit, the current has multiple paths to flow through, reducing the overall resistance.
As temperature increases, the resistance of most materials also increases. This is because as the temperature rises, the atoms in the material vibrate more, making it harder for electrons to flow through. However, some materials, such as semiconductors, may have a decrease in resistance with an increase in temperature.