It's is not alternate energy but like to build one - Page 3 - Electronic Circuits Projects Diagrams Free

**Nigel Goodwin** · 19th March 2007, 06:20 PM

Quote:

Originally Posted by Thunderchild

oh thank you oh gods what suddenly made you change your minds ? I do have to say I erred in comparing the 19" (got mixed up with what the original poster said) I was refering to 17",
My dads 17" CRT as stated by the manual uses 105 W my 15" monitor that is only 0.5 cm (0.2") smaller than the 17" CRT uses 20 watts AT MOST !

Try comparing like with like! - you're reading the value off the manual for the CRT, but actually measuring your LCD - what does your LCD manual say?, it won't be 20W. My 19 inch LCD says 50W - I haven't measured it, but would expect it to be usually less than that in normal use - just as a CRT will be less than it says in the manual.

Quote:

now I hate to immagine what that guys kids 19" CRTs are using more like 120 watts each at least so we are looking at 360 W for the monitors before counting 80-120 W for the computers he could easily be using 700 W for his kids computers and then wonders where it goes....

Thunderchild · 19th March 2007, 07:14 PM

well when measuring the CRT with an ex electric boards meter it was 90 or more watts I think

Hero999 · 21st March 2007, 05:28 PM

Did you just use a current meter again?

If so you might be incorrect, sure it's using 90VA but it doesn't mean it's using 90W.

Thunderchild · 21st March 2007, 07:47 PM

no for the CRT i used an ex electric board meter so it measured what the electric company will read and charge for

Tim_B · 13th May 2007, 08:51 PM

Going back to the original post on knowing how much energy your using this is a very nice device about to be launched in the UK

http://www.currentcost.com/

I want one!

Tim_B · 13th May 2007, 08:57 PM

In fact I was in the process of doing my own when I can across it.

As a general offer I'm offering my time free for a project that needs coding help if it will have an impact on saving energy and global warming etc

**Nigel Goodwin** · 13th May 2007, 10:13 PM

Check the last two issues of EPE, they have a suitable project!.

Oznog · 14th May 2007, 04:21 AM

Well, back to the original question:

Voltage and phase MUST be measured along with current to produce an accurate reading. Otherwise you will be including reactive power along with the real power and you only have an interest in real power.

The power company's glass bubble meter uses a mechanical, yet surprisingly accurate mechanism that inherently takes into account voltage, current, and phase angle. Pretty neat, actually. In fact a digital device has to be well-designed and a bit complicated to approach the effectiveness of the bubble.

You can manually read the dials to find you consumption day-by-day, and read you power company's KWH cost to figure out what you use over a fixed time period.

There's a device called a "KILL-A-WATT" meter that Harbor Freight Tools sells now. These are quite nifty. They'll measure the consumption of anything you can plug into a 110V outlet. It'll show real power consumption, power factor, total KWH consumed since it was reset, just about anything you could want. This may even be more helpful than a "whole house" meter because that would not clearly spell out what each device costs. Well, the KILL-A-WATT can't measure your room lights that don't plug in, but then a 100W bulb pretty much takes 100W, doesn't it?

I've measured my PC and monitor. IIRC that thing was well over 200W, pretty hefty cost being left on all the time.

Thunderchild · 14th May 2007, 08:12 PM

and what monitor do you have ?

Just to spell it out to the disbeleiving people that practically called me a liar:

My dads 17" CRT said in the instructions 105 W
My new 19" flat screen in the instructions says 42 W so there you have it straight from the mouth of the manufacturer now am I a liar ?
considering that my monitor has photo and video inhancement ability's that I don't use it is likely that I use less than 42 W or at least I hope so if this thing was green mindedly designed

mramos1 · 14th May 2007, 08:58 PM

Shoot was in Harbor Freight today, forgot to look. I will check the web as well. I toy I must have.

Thanks Oznog..

**Nigel Goodwin** · 14th May 2007, 10:35 PM

Quote:

Originally Posted by Thunderchild

and what monitor do you have ?

Just to spell it out to the disbeleiving people that practically called me a liar:

My dads 17" CRT said in the instructions 105 W
My new 19" flat screen in the instructions says 42 W so there you have it straight from the mouth of the manufacturer now am I a liar ?

Have you measured what they take?, the LCD will take the same current all the time (dependent on the back light setting), the CRT will vary considerably depending on beam current.

Fred.Amoson · 15th May 2007, 01:30 PM

CRTs use less with a black background and more with a white background. That is why some people were trying to get Google to turn their background to black, save energy.

As far as LCDs being much more efficient than CRTs, of course they are. I can't believe some of you are even arguing that. Some of you are stating how much power it consumes by what the power supply is rated at? Come on, that is complete BS! The power that power supply uses depends on it's load. I really thought better of some of you...

As far as turning off computers, it is a good idea. But if you need the super quick boot time, put it to sleep. I have an intel iMac and it uses 3 watts (via Kill-A-Watt) when it is sleeping. This is the same amount of power it uses when it is off, since it is not completely unplugged when it is off (digital on switch). So I just have my computer set to goto sleep after 10 minutes of no use, and if I am going to be gone for the weekend I unplug all of my stuff so it draws no extra current.

**Nigel Goodwin** · 15th May 2007, 03:38 PM

Quote:

Originally Posted by Fred.Amoson

As far as LCDs being much more efficient than CRTs, of course they are. I can't believe some of you are even arguing that.

Like I've been saying, MEASURE them and compare. You can't blindly assume that all CRT's use more power than all LCD's - this isn't true!. Modern TV's have been using less and less current as they developed over the last 10 or 20 years, and many use LESS power than similar sized LCD ones. The TV on peak while may use more, but the LCD takes full power all the time, on average some CRT's beat some LCD's.

Fred.Amoson · 15th May 2007, 03:55 PM

I have measured, as I have both LCDs and CRTs. What you are saying is not accurate.

If you insist that it is, show me a source that shows that CRTs use even close to the same amount of power as an LCD of the same size.

**Nigel Goodwin** · 15th May 2007, 04:06 PM

Quote:

Originally Posted by Fred.Amoson

I have measured, as I have both LCDs and CRTs. What you are saying is not accurate.

So you've measured every CRT set and LCD set there is?, I think it's more likely you've measured the incredibly small sample you have access to!

19th March 2007, 07:14 PM	(permalink)
Thunderchild Experienced Member	well when measuring the CRT with an ex electric boards meter it was 90 or more watts I think __________________ I AM the exeption that disproves the rule in many ways but the rules still apply (unfortunately) my site:www.simons-photography.com http://rushdenrotaract.org.uk see also http://www.bigstockphoto.com/account...fid=m2URATYch5 http://www.redbubble.com/people/simonsphotography

21st March 2007, 05:28 PM	(permalink)
Hero999 Experienced Member	Did you just use a current meter again? If so you might be incorrect, sure it's using 90VA but it doesn't mean it's using 90W. __________________ What's so bad about Microsoft? Get Opera it's simply a superb browser.

21st March 2007, 07:47 PM	(permalink)
Thunderchild Experienced Member	no for the CRT i used an ex electric board meter so it measured what the electric company will read and charge for __________________ I AM the exeption that disproves the rule in many ways but the rules still apply (unfortunately) my site:www.simons-photography.com http://rushdenrotaract.org.uk see also http://www.bigstockphoto.com/account...fid=m2URATYch5 http://www.redbubble.com/people/simonsphotography

13th May 2007, 10:13 PM	(permalink)
Nigel Goodwin Super Moderator	Check the last two issues of EPE, they have a suitable project!. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

14th May 2007, 04:21 AM	(permalink)
Oznog Experienced Member	Well, back to the original question: Voltage and phase MUST be measured along with current to produce an accurate reading. Otherwise you will be including reactive power along with the real power and you only have an interest in real power. The power company's glass bubble meter uses a mechanical, yet surprisingly accurate mechanism that inherently takes into account voltage, current, and phase angle. Pretty neat, actually. In fact a digital device has to be well-designed and a bit complicated to approach the effectiveness of the bubble. You can manually read the dials to find you consumption day-by-day, and read you power company's KWH cost to figure out what you use over a fixed time period. There's a device called a "KILL-A-WATT" meter that Harbor Freight Tools sells now. These are quite nifty. They'll measure the consumption of anything you can plug into a 110V outlet. It'll show real power consumption, power factor, total KWH consumed since it was reset, just about anything you could want. This may even be more helpful than a "whole house" meter because that would not clearly spell out what each device costs. Well, the KILL-A-WATT can't measure your room lights that don't plug in, but then a 100W bulb pretty much takes 100W, doesn't it? I've measured my PC and monitor. IIRC that thing was well over 200W, pretty hefty cost being left on all the time. __________________ I thought what I'd do was I'd pretend I was one of those deaf-mutes.

13th May 2007, 08:51 PM	(permalink)
Tim_B Experienced Member	Going back to the original post on knowing how much energy your using this is a very nice device about to be launched in the UK http://www.currentcost.com/ I want one!

13th May 2007, 08:57 PM	(permalink)
Tim_B Experienced Member	In fact I was in the process of doing my own when I can across it. As a general offer I'm offering my time free for a project that needs coding help if it will have an impact on saving energy and global warming etc

14th May 2007, 08:12 PM	(permalink)
Thunderchild Experienced Member	and what monitor do you have ? Just to spell it out to the disbeleiving people that practically called me a liar: My dads 17" CRT said in the instructions 105 W My new 19" flat screen in the instructions says 42 W so there you have it straight from the mouth of the manufacturer now am I a liar ? considering that my monitor has photo and video inhancement ability's that I don't use it is likely that I use less than 42 W or at least I hope so if this thing was green mindedly designed __________________ I AM the exeption that disproves the rule in many ways but the rules still apply (unfortunately) my site:www.simons-photography.com http://rushdenrotaract.org.uk see also http://www.bigstockphoto.com/account...fid=m2URATYch5 http://www.redbubble.com/people/simonsphotography

14th May 2007, 08:58 PM	(permalink)
mramos1 Experienced Member	Shoot was in Harbor Freight today, forgot to look. I will check the web as well. I toy I must have. Thanks Oznog..

15th May 2007, 01:30 PM	(permalink)
Fred.Amoson Experienced Member	CRTs use less with a black background and more with a white background. That is why some people were trying to get Google to turn their background to black, save energy. As far as LCDs being much more efficient than CRTs, of course they are. I can't believe some of you are even arguing that. Some of you are stating how much power it consumes by what the power supply is rated at? Come on, that is complete BS! The power that power supply uses depends on it's load. I really thought better of some of you... As far as turning off computers, it is a good idea. But if you need the super quick boot time, put it to sleep. I have an intel iMac and it uses 3 watts (via Kill-A-Watt) when it is sleeping. This is the same amount of power it uses when it is off, since it is not completely unplugged when it is off (digital on switch). So I just have my computer set to goto sleep after 10 minutes of no use, and if I am going to be gone for the weekend I unplug all of my stuff so it draws no extra current.

15th May 2007, 03:55 PM	(permalink)
Fred.Amoson Experienced Member	I have measured, as I have both LCDs and CRTs. What you are saying is not accurate. If you insist that it is, show me a source that shows that CRTs use even close to the same amount of power as an LCD of the same size.

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