What is resistance?

Resistance is defined as the opposition to the flow of electric current within a conductor. When voltage is applied across a conductor, electrons move to create an electric current. However, the materials in the conductor impede this movement to some extent, which is quantified as resistance. Higher resistance means that it is more difficult for current to flow, while lower resistance allows current to flow more freely.

This concept is fundamental in understanding electrical circuits and is measured in ohms. It plays a crucial role in determining how much current will flow for a given voltage according to Ohm’s law, which states that current is equal to voltage divided by resistance (I = V/R). The relationship between voltage, current, and resistance is essential for designing and analyzing electrical systems effectively.