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The reason I ask, is that I just got a few "energy saving bulbs and on them they say:
"11W, 220-240V, 96mA

Unless my maths is wrong, using ohms law that doesn't really work out.

I had a look on my normal filament bulbs, but they don't say how many amps they use, so I decided to look on the internet.

The only thing I found was here: http://answers.yahoo.com/question/?link=ask&l=c&qid=&title=&eval_final=&.crumb=2Erv97koPqG&kid=
"240V Light Bulbs - for every 10 watts allow 800mA"

But that means that my 40w bulbs draw more current than my projector (which draws about 1.4A). And the projector has a very very bright bulb, fans and the electrics inside etc.

So here I am asking: How much current does (for example) a 60w bulb in the UK (240v) draw?

2007-03-04 09:59:58 · 5 answers · asked by pandaking 1 in Science & Mathematics Physics

Sorry that link was wrong. This is what I found:
http://www.sunshinesolar.co.uk/cat--Technical-Support--techsupp

2007-03-04 10:01:03 · update #1

5 answers

11W, 220-240V, 96mA:
Ya, I disagree with that too. P = E*I = 11W = 240*I. So I = 45.8 ma, about 1/2 of what they say.

"240V Light Bulbs - for every 10 watts allow 800mA":
I think they are talking about how many amps a solar panel needs to provide a power converter that is going to light a bulb. The inefficiency of the converter is in the calculation.

Ohm's law does work for AC in cases where the load is pure resistance, like in the case of an incandescent bulb.

2007-03-04 13:49:27 · answer #1 · answered by sojsail 7 · 0 0

Belive it or not an averge 60 watt light bulb draws more current than you average Telivision Set

2007-03-04 10:08:41 · answer #2 · answered by Anonymous · 0 0

1000

2007-03-04 10:01:34 · answer #3 · answered by Anonymous · 0 0

Ohms law is for direct current. You are trying to use it for alternating current.

Back to the text book for you to learn about the magical .707.

2007-03-04 10:05:39 · answer #4 · answered by Anonymous · 0 0

#1 Powerful Tactical Flashlight - http://FlashLight.uzaev.com/?Redx

2016-07-11 02:08:51 · answer #5 · answered by ? 3 · 0 0

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