Final answer:
It is false that a relay's contact rating is the same for both AC and DC currents, as the two types of current have different effects on relay contacts and circuit breaking.
Step-by-step explanation:
The contact rating for a relay is not necessarily the same for AC (Alternating Current) and DC (Direct Current) currents. This is because each type of current affects relay contacts differently.
For instance, AC may cause the contacts to oxidize differently than DC, and the extinguishing of the arc when the contacts open can be easier for AC due to the zero crossing of the current. It's also likely that the relay's ability to break the circuit may differ between AC and DC due to inductive loads in DC circuits that aren't present in AC circuits or are present to a lesser extent.
Therefore, it is false that a specific relay's contact rating is the same for AC and DC currents.