What is the approximate resistance of the coil in a current relay used with small single-phase compressors?

The approximate resistance of the coil in a current relay used with small single-phase compressors is around 1 ohm. This value is significant because it allows for effective operation of the relay, ensuring that it can respond properly to changes in current. Relays are designed to activate at specific current levels, and a resistance of about 1 ohm is typical for these applications as it strikes a balance between being low enough to allow adequate current flow for activation and not too low to cause excess power consumption or heat generation.

In smaller compressors, where the relays need to handle moderate currents, a coil resistance around this value is optimal to ensure reliability and efficiency. The other options represent resistance values that are either too high or too low for typical current relay applications in this context. Using a resistance that deviates significantly from 1 ohm could lead to malfunctioning of the relay, resulting in inadequate compressor operation or potential damage.