True or False: A relay can be effectively tested by measuring its resistance out of circuit.

A relay can indeed be effectively tested by measuring its resistance when it is out of the circuit. This is because measuring resistance helps determine the integrity of the relay's coil. When you perform a resistance test, you check for continuity and ensure that the coil is intact and functioning properly. If the resistance measurement falls within the expected range for the specific relay model, it indicates that the coil is in good condition and there are no breaks in the winding.

However, testing a relay in-circuit can sometimes yield misleading results due to interactions with other components, which is why out-of-circuit testing is preferred in many circumstances. If the relay has contacts that are open or closed, measuring resistance will provide clear insight into the coil's condition, without the influence of other elements in the circuit. Thus, the ability to effectively assess the relay's functionality through resistance measurements solidifies why this statement is true.