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Apr
29
comment How is 6W equivalent to 40W, as claimed by adverts for LED light bulbs?
@BrianKnoblauch wire two '75W equivalent' LED lights to a hair dryer, and use that in your garage or under the hood then! You get 15x the heat output of a 100W light bulb, with more light!
Apr
29
comment How is 6W equivalent to 40W, as claimed by adverts for LED light bulbs?
@CuriousOne I clarifying that the power ratings aren't overspecced needlessly - though they may be an upper bound not a median for safety reasons, it wasn't a marketing thing to increase sales or anything. For LED lights, I somewhat agree they are marketing these really hard; the other thing they don't mention is that they are more directional, and a '40W' equivalent LED may not provide as much illumination in all directions as a 40W incandescent, and that also isn't mentioned.
Apr
29
comment How is 6W equivalent to 40W, as claimed by adverts for LED light bulbs?
Incandescent power ratings are important - they need to be matched to an outlet capable of supplying that wattage, or there can be fire risks. Over time, though, the buying public started equating power ratings (not over-specced) with brightness (not correct to do), and so we have these "40W equivalent" for people who still think of brightness in terms of incandescent power ratings.
Apr
23
awarded  Yearling
Mar
16
awarded  Popular Question
Mar
16
awarded  Popular Question
Feb
2
comment Why is 7 TeV considered as a big amount of energy?
I'll try to answer that with two assumptions: the 'average' collision rate is held constant for the entire season of "600 million collisions per second" (Source), and the energy released in every collision is ONLY the kinetic energy of stopping the particles. Thus, $600,000,000\ per\ second * 7\ TeV * 2 = 1345.83\ Joules\ per\ second = 1.35\ kW$, or $0.001\%$. This is, of course, absurd, as the 'purpose' of the LHC is more than just 'producing collisions', and the 120MW includes additional processing, cooling, etc.
Jan
16
awarded  Guru
Jan
15
awarded  Good Answer
Jan
15
awarded  Nice Answer
Jan
15
revised Why is 7 TeV considered as a big amount of energy?
Fixed typos, added airplane example for comparison
Jan
15
answered Why is 7 TeV considered as a big amount of energy?
Jan
10
awarded  Notable Question
Oct
6
awarded  Good Question
Oct
1
awarded  Famous Question
Jul
24
comment How does a planet's size really affect its surface gravity?
Great ball park analysis! Good work.
Jun
1
awarded  Popular Question
May
5
revised Hydrogen-boron fusion
Used numbered list.
May
5
suggested approved edit on Hydrogen-boron fusion
Apr
29
comment Is there any disadvantage to sending rockets straight up?
Right, but crossing into the Moon's SOI is roughly equivalent to what I meant by crossing the Earth - Moon L1.