In terms of electrical systems, what does resistance refer to?

Resistance refers to the opposition to the flow of electric current within a circuit. It is a fundamental concept in electrical systems, measured in ohms, and directly affects how much current can flow under given voltage conditions, according to Ohm's Law (V = I × R, where V is voltage, I is current, and R is resistance).

In practical terms, this means that materials with high resistance will impede the flow of electric current, while materials with low resistance allow for easier current flow. Resistance can be influenced by various factors including the material's composition, temperature, and physical dimensions, making it a crucial parameter in designing and analyzing electrical circuits. Understanding resistance is essential for electricians and engineers when sizing conductors and ensuring the safety and efficiency of electrical systems.