How Light Works For Kids
How much current does the average light bulb draw.?
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?
Sorry that link was wrong. This is what I found:
http://www.sunshinesolar.co.uk/cat–Technical-Support–techsupp
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.
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