What limits current in a DC circuit within a contactor or relay?

In a DC circuit, the flow of electric current is primarily limited by the resistance present in the circuit. Resistance is a property that opposes the flow of electric current, resulting in a controlled amount of current passing through components like contactors or relays. In applications involving contactors and relays, ensuring a specific current level is crucial for the operation and reliability of these devices.

While impedance is a broader term that includes both resistance and reactance (which is relevant in AC circuits involving capacitors and inductors), it is resistance that specifically defines the opposition to direct current. Capacitance and inductance are more relevant in AC circuits and do not play a significant role in limiting current in a purely DC context. Thus, the focus on resistance provides the most accurate understanding of how current is regulated in DC circuits involving contactors and relays.