Resistance is defined as?

Resistance is defined as the opposition to the flow of electrons in a circuit. It plays a critical role in electrical circuits, as it determines how much current will flow for a given voltage applied across a component, according to Ohm's Law (V = I * R). When a circuit has higher resistance, it allows less current to flow, while lower resistance enables more current to pass through.

In practical terms, resistance affects how devices operate within an electrical system. For instance, electrical components like resistors are specifically designed to provide a certain level of resistance, helping to regulate current and manage power within the circuit effectively. Understanding resistance is essential for HVAC technicians, as many HVAC systems rely on electrical components and require proper management of current and voltage to function efficiently.