just got a diagram of a 8 channel board i think it is the same with the relay in other pic.. i would like to know if this will work for my project that need to power up 220v home appliances. i got a diagram because we were ask to build some relay.. please comment if this enough for the said project thanks.. just a newbie here thanks!
You have to ensure the relays can handle the load(s). From that photograph it looks like 10A resistive at 240Vac, you'd have to look up the relevant datasheet for the inductive load limit (and recommended snubber circuit) if switching inductive loads like motors.
This sounds like we did this whole thing once before. Maybe search the forums over the last month or so and see what your class mate asked.
What are the loads you want to switch ?