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Topic:
Electricity question [Locked] |
Halloweve  Posts: 422
Registered: 2004-3-6 10:19:02
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Date Posted:
1/1/00 12:00am
Subject:
Electricity question |
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Yes, IMHO...but power usage can be made equal.
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Elkad Title: aka Ebenezer
Posts: 407
Registered: 2003-9-11 22:20:55
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Date Posted:
1/1/00 12:00am
Subject:
Electricity question |
A watt is a watt is a watt.
The only question was covered above. Is it a 20w bulb in a 12v socket? (meaning the 120v>12v transformer uses a bit of extra power). Or does the whole thing use 20w (which means w/equal efficiency, the low-voltage one will put out less light).
And it's winter anyway. Just use a regular bulb until you turn the heat off for the summer, it's cheaper.
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"I would rather be exposed to the inconveniences attending too much liberty, than those attending too small a degree of it." - Thomas Jefferson
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__Bonk__  Posts: 5,122
Registered: 2009-7-25 03:04:52
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Date Posted:
1/1/00 12:00am
Subject:
Electricity question |
How many amps?
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A change in feeling is a change in destiny.
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IMHO  Title: Official Outpost Greeter
Posts: 2,287
Registered: 2001-11-1 03:55:02
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Date Posted:
1/1/00 12:00am
Subject:
Electricity question |
__Bonk__ posted:
How many amps?
12v / 20w = 1.67amps
120v / 20w = 0.167amps
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__Bonk__ Posts: 5,122
Registered: 2009-7-25 03:04:52
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Date Posted:
1/1/00 12:00am
Subject:
Electricity question |
Therefore I would say the exact same amount because I think amps have to do with the number of electrons
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I keep my eyes fixed on the sun!
A change in feeling is a change in destiny.
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Date Posted:
1/1/00 12:00am
Subject:
Electricity question |
e over i x r
i could troubleshoot the circuit and repair it as needed but im not an electrical engineer and i hate doing math too much to bother trying to figure out the answer to this.
but i agree with whomever said it depends on the transformer in the socket that converts 120 to 12v
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Jesus? No, but there is indeed a god shaped hole in the heart of man, why is yours so empty? -- snarf igraine
the original monotheism: http://en.wikipedia.org/wiki/Phallus |
cherrim  Posts: 68
Registered: 2003-4-6 21:57:39
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Date Posted:
1/1/00 12:00am
Subject:
Electricity question |
V = I * R
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One special advantage of the skeptical attitude of mind is that a man is never vexed to find that after all he has been in the wrong.
- William Osler
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Date Posted:
1/1/00 12:00am
Subject:
Electricity question |
cherrim posted:
V = I * R
e is amperage/ electromotive force
i, i believe, is inertia(?)/ volts
r is resistance
voltage times resistance gives you amperage
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Jesus? No, but there is indeed a god shaped hole in the heart of man, why is yours so empty? -- snarf igraine
the original monotheism: http://en.wikipedia.org/wiki/Phallus
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Date Posted:
1/1/00 12:00am
Subject:
Electricity question |
sweeny_comodore posted:
cherrim posted:
V = I * R
e is amperage/ electromotive force
i, i believe, is inertia(?)/ volts
r is resistance
voltage times resistance gives you amperage
Incorrect. V (or E) is voltage, I is current, measured in Amperes, R is resistance. Current times resistance equals voltage. And you can rearrange the formula however you like, as per Ohm's law.
Your bulbs, as Elkad stated, draw the same amount of power, but require vastly different amounts of current. 20w = 20w no matter what, and watts are found by current (I) times voltage. Thus, your 12v/20W bulb is drawing 10x more current, to dissapate the same amount of power.
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Date Posted:
1/1/00 12:00am
Subject:
Electricity question |
Eternal_Midnight posted:
sweeny_comodore posted:
cherrim posted:
V = I * R
e is amperage/ electromotive force
i, i believe, is inertia(?)/ volts
r is resistance
voltage times resistance gives you amperage
Incorrect. V (or E) is voltage, I is current, measured in Amperes, R is resistance. Current times resistance equals voltage. And you can rearrange the formula however you like, as per Ohm's law.
Your bulbs, as Elkad stated, draw the same amount of power, but require vastly different amounts of current. 20w = 20w no matter what, and watts are found by current (I) times voltage. Thus, your 12v/20W bulb is drawing 10x more current, to dissapate the same amount of power.
lol
i had to go look it up.
20 years ago i would have gotten that right on the first try.
wtf remembers what e and i stand for?
maybe thats why they are teaching v over i times r now adays?
-----signature-----
Jesus? No, but there is indeed a god shaped hole in the heart of man, why is yours so empty? -- snarf igraine
the original monotheism: http://en.wikipedia.org/wiki/Phallus
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