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jeffslife
Joined: 17 Apr 2010 Posts: 4181 Location: ohio usa
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Link Posted: Wed Jan 25, 2023 12:41 am Post subject: 110, 120, 240, 220 volts on amps |
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so the voltage selector on my yamaha amps allow me to set the voltage as shown above.
I got them they were all at 110v I changed it to 120v.
Thinking about putting in a few 240v outlets and running them at that voltage.
Any thoughts ? or is it irrelevant ?
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AnalogRocks Forum Moderator
Joined: 08 Mar 2006 Posts: 26690 Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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Link Posted: Wed Jan 25, 2023 12:49 am Post subject: |
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Twice the voltage half the amperage. Maybe run cooler?
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kal Forum Administrator
Joined: 06 Mar 2006 Posts: 17860 Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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jeffslife
Joined: 17 Apr 2010 Posts: 4181 Location: ohio usa
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Link Posted: Thu Jan 26, 2023 3:32 pm Post subject: |
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No recommendation . US voltage is 120. I thought maybe it was maybe like the myth that 240 is cheaper than 120. i have been told that in many things
are designed using 240 and actually work better using that voltage. Sounds right.
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kal Forum Administrator
Joined: 06 Mar 2006 Posts: 17860 Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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Link Posted: Thu Jan 26, 2023 4:27 pm Post subject: |
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jeffslife wrote: | I thought maybe it was maybe like the myth that 240 is cheaper than 120. |
It's not a myth. It's science/physics.
In North America we have both 120V and 240V available in our homes. 240V is used on select high power items (stoves, air conditioners, car chargers, baseboard heaters, etc.) because it costs less the implement in terms of the conductor size (usually copper). The higher the current you want to pass through a wire, the thicker the wire needs to be to accommodate that, so the higher the cost. Most wire is copper and copper is expensive.
Remember that Power (watts) = Volts x Current
If you increase the volts from 120V to 240V you can double the power without having to change the current. So the same size wire can be used but it can now pass twice the power.
Kal
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jeffslife
Joined: 17 Apr 2010 Posts: 4181 Location: ohio usa
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Link Posted: Thu Feb 02, 2023 2:51 pm Post subject: |
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I meant cheaper in the sense of your electric bill is cheaper. The wire gauge makes perfect sense.
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kal Forum Administrator
Joined: 06 Mar 2006 Posts: 17860 Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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Link Posted: Thu Feb 02, 2023 3:30 pm Post subject: |
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Correct. Your power company bills you based on power (wattage) used, not the voltage it's delivered at.
Homes in North America have both 120V and 240V available. This split is also all after the meter used to measure your usage so the power company doesn't know what your 120V vs 240V usage is. Your home sees 240v coming in off the transformer, with a center tap to give you neutral, allowing 120V to also be supplied.
Note that AC voltage in North America is 120V and 240V. There is no 110V or 220V (hasn't been in ~75 years) but people still incorrectly mention 110V and 220V all over the place for some reason. It just won't go away. So when someone says they want to install a 220V outlet, they mean 240V. There is no 220V.
Kal
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virusc
Joined: 11 Apr 2007 Posts: 322 Location: Massachusetts
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Link Posted: Sat Feb 11, 2023 9:54 pm Post subject: |
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With modern gear (SMPS) power supplies the difference in efficiency is very small (normally 2-3% or less) My experience is from IT gear mainly but it comes up with customers from time to time. I would not consider any efficiency saving as a improvement. Their is a huge improvement though in amount of gear you can run on a single 240v line though and that can lead to savings and maybe some more current overhead for a really power hungry amp. The only way you are drawing more current that is wasted is if your 120v romex is overheating and has voltage drop. This would be bad anyway and the cable would feel warm.
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