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For the 16 CH 12V Relay module, does the output currency mean that we could run 5VDC, 12VDC or 24VDC through the relay? What ever current we input will be the output current, correct?

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You still haven't replied to our question on this question of yours. And I told you I won't answer any more of your questions until you accept a few answers. – stevenvh Jul 19 '12 at 5:02

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1) Yes, the relays installed on the module are rated at 30VDC, 10A; so you can use it to drive anything below that range (that means 5VDC, 12VDC, 24VDC are ok. Make sure the current are below 10A though).

2) Yes, relay works like a physical switch; once connected, the current flows. The rated contact resistance of the relay is 100mOhm.

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Loss in a relay is definitely not negligible. At 100 m\$\Omega\$ contact resistance and a current of 10 A dissipation in the contact will be 10 W! – stevenvh Jul 19 '12 at 5:15
@stevenvh you are right. Just found out that the rated max contact resistance the relay is 100mOhm. I got used to ignore it because the load i connect my relay normally have much higher resistance compare to the relay. thanks. – JeeShen Lee Jul 19 '12 at 5:24

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