fawk3s said:
Resistance is the measure of how much a material or component resists the flow of electric current. It is measured in units called Ohms (Ω) and can be calculated using Ohm's Law, which states that resistance equals voltage divided by current.
When resistors are added in series, the total resistance increases as the individual resistances add up. When resistors are added in parallel, the total resistance decreases as the inverse of the individual resistances add up.
Yes, the resistance of a circuit can change over time due to factors such as temperature, material degradation, and external influences. This is why components like resistors are given a tolerance value to account for potential changes in their resistance.
The length of a wire is directly proportional to its resistance, meaning a longer wire will have a higher resistance. The thickness or cross-sectional area of a wire is inversely proportional to its resistance, meaning a thicker wire will have a lower resistance.
Different materials have different resistivities, which is a measure of how easily a material allows electric current to flow through it. Materials with higher resistivities will have higher resistance, while materials with lower resistivities will have lower resistance.
