Relay's isolation

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hello, have questions usage of relays.


i bought electromagnetic relay :
http://www.volumerate.com/product/diy-1-channel-5v-relay-with-lamp-382151?utm_source=vr&utm_medium=productbysearch&utm_campaign=search#specifications-detailinfo


and have questions how use thing.

1) connected power socket ( using plug, lightbulb socket+lightbulb, , relay ), , wired 2 wires no , com wire-socket ( word ? ) there third socket, labeled nc didnt use it. "small" problem took relay hand when plugged plug, , tazed me super hard, whole arm shook... suspect came solder on bottom of card... can confirm ? also, precautions should take while handling ?

2) how works ? why there 3 pins ( vcc, in1, gnd ) ?
how plug controll arduino ?

quote
the "small" problem took relay hand when plugged plug, , tazed me super hard, whole arm shook... suspect came solder on bottom of card... can confirm it
i assume had plugged power line?

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also, precautions should take while handling
don't touch anything while it's plugged-in dangerous voltages! ;)    and, mount in come kind of enclosure nobody else touches either.

quote
2) how works ? why there 3 pins (vcc, in1, gnd ) ?
first, don't just  have relay, have relay module, pc board relay, driver circuit, , couple of leds.   that's good, need driver circuit drive relay arduino.

here schematic spdt (single-pole, double-throw) relay without driver.

there 5 terminals.  two coil, , 3 contacts.    notice there no electrical connection between coil , contacts, if switching ac power ac power totally isolated low-voltage circuitry.

"c" common , it's connected "nc" (normally closed contact) when relay not energized.    when relay energized, "no" (normally open) gets connected common.    nc , no never connected together.


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how plug controll arduino ?
connect vcc 5v , gnd ground.  connect in1 arduino output pin of choice, , program pin control relay.

since bought unknown manufacture , flakey supplier, don't schematic or complete-detailed specs.  ;)


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