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GrownTree
Joined: 07 Apr 2011 Posts: 1 Location: Canada
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Posted: Thu Apr 07, 2011 6:35 am Post subject: Can I use 220V 40W light bulb as resistor to lower voltage? |
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Can I use an incandescent 220V 40W light bulb as a resistor connected in series with a 110V 15W power supply for my electronic device?
Situation is that I am in a small town in Eastern Europe and I can NOT find a 220V to 110V transformer here.
Any other ideas as to how to lower local 220V to 110V 15Watt without transformer? _________________ GrownTree |
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torbjorn
Joined: 07 Jun 2007 Posts: 370 Location: Sweden
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Posted: Mon Apr 11, 2011 12:27 pm Post subject: |
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It is probably not recommendable to use a light bulb as ballast resistor in this manner, as the resulting voltage will vary depending on the actual power consumption of your power supply.
The best solution would of course be to replace the power supply with one rated for 220 V.
Another makeshift possibility is to use any mains transformer of suitable power rating and with switchable primary for 220 and 110 V as an autotransformer. Connect the 220 V mains across the whole primary winding and take out 110 V between neutral and the 110 V tap. |
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Flash1940
Joined: 26 May 2011 Posts: 3 Location: Paris, Kentucky
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Posted: Thu May 26, 2011 6:32 pm Post subject: |
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A light bulb is a poor man's constant current source and is NOT a linear resistance. They all have a curve and become higher in resistance the brighter they glow. Would not likely be a very predictable device to use in your application. However....this technique is really handy when working on equipment that is blowing fuses. I think you can visualize how to use it.
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