- #1
HeyAwesomePeopl
- 40
- 0
Hey guys, hopefully this is the right subforum..
Anyways, I am wondering how to read the ratings of a relay. Here is what I am looking at:
http://www.ebay.com/itm/5pcs-5V-T73-SRD-5VDC-SL-C-5Pin-10A-Relay-Module-Arduino-ARM-PIC-AVR-DSP-/161755474571?pt=LH_DefaultDomain_0&hash=item25a960aa8b
The rating for this piece is 10A @ 240VAC/125VAC, or 10A @ 30VDC. Would it be safe to use these relays with mains power(110v US, 20A)?
Say I want to switch on/off a lamp. The lamp has a 100watt light bulb. I know that 110v and 20 amps comes out of the socket, and I know that 110v AC is not a problem for the relay. But what about the 20 amps? At 110v, wouldn't the light bulb technically need around about 0.9 amps to run? Would this be safe to assume that technically only ~0.9 amps is being fed through the wires at any time?
Another example, say I have my PC. My power supply is rated for 600 watts with 80% efficiency. So this gives me a max wattage at any time to be 720(am I right here?). With Ohms law you could calculate that at 720 watts max, and 110v, the maximum amperage would be around 6.5? Once again, this would be safe for the relay, right?
Thanks,
HeyAwesomePeople
Also quick question. If I wanted to protect the relay from ever receiving over 10 amps, I would just use a fuse, right?
1
Anyways, I am wondering how to read the ratings of a relay. Here is what I am looking at:
http://www.ebay.com/itm/5pcs-5V-T73-SRD-5VDC-SL-C-5Pin-10A-Relay-Module-Arduino-ARM-PIC-AVR-DSP-/161755474571?pt=LH_DefaultDomain_0&hash=item25a960aa8b
The rating for this piece is 10A @ 240VAC/125VAC, or 10A @ 30VDC. Would it be safe to use these relays with mains power(110v US, 20A)?
Say I want to switch on/off a lamp. The lamp has a 100watt light bulb. I know that 110v and 20 amps comes out of the socket, and I know that 110v AC is not a problem for the relay. But what about the 20 amps? At 110v, wouldn't the light bulb technically need around about 0.9 amps to run? Would this be safe to assume that technically only ~0.9 amps is being fed through the wires at any time?
Another example, say I have my PC. My power supply is rated for 600 watts with 80% efficiency. So this gives me a max wattage at any time to be 720(am I right here?). With Ohms law you could calculate that at 720 watts max, and 110v, the maximum amperage would be around 6.5? Once again, this would be safe for the relay, right?
Thanks,
HeyAwesomePeople
Also quick question. If I wanted to protect the relay from ever receiving over 10 amps, I would just use a fuse, right?
1