resistance

In an electric circuit, it is a component that limits the flow of current against voltage, and the difficulty of flow is determined by resistivity. It is one of the basic and important components that make up a switching circuit. Mainly used to control (step down) voltage, but power loss due to heat generation occurs. All materials have a resistance component; materials with very low resistance are used as conductors, and materials with very high resistance are used as insulators. A pure resistor allows an alternating current of similar waveform and same phase to flow in response to an alternating voltage.