Okay, so I'm using an Arduino Uno R3 and I wanted to start of my own home automation project. I have a 4 channel 12V relay board and I normally connect it to a 12V 500mA adapter. What is the maximum wattage bulb (or CFL) that I can power with this configuration?
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The ampere rating should be printed on the relays. `Watts = Amps x Voltage` – Gerben Dec 07 '14 at 15:43
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@Gerben. Thanks for the heads up! It says 5A 240V AC and the coil is 12V DC. – Shivang Kumar Dec 08 '14 at 06:54
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Than that's 1000Watt if you're on 220V AC, 500Watt if your on 110V AC (e.g. US). Good luck finding a 1000Watt CFL :-P – Gerben Dec 08 '14 at 16:16
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Unless you feel like starting a fire, none. Find a 220V 2A relay with a 5V coil and use that instead, switching the hot wire and not the neutral.
Ignacio Vazquez-Abrams
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Huh? If the OP builds a circuit to switch 12v (with a flyback diode) why would the relay board in question start a fire? – Duncan C Jan 07 '15 at 03:11
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@DuncanC: There aren't many CFL bulbs that run on 12V, and the asker hadn't given the contact specifications yet. – Ignacio Vazquez-Abrams Jan 07 '15 at 04:23