{"id":369,"date":"2017-08-01T08:09:23","date_gmt":"2017-08-01T08:09:23","guid":{"rendered":"http:\/\/buklijas.info\/blog\/?p=369"},"modified":"2017-07-23T16:01:47","modified_gmt":"2017-07-23T16:01:47","slug":"computer-setup-electricity-consumption","status":"publish","type":"post","link":"http:\/\/buklijas.info\/blog\/2017\/08\/01\/computer-setup-electricity-consumption\/","title":{"rendered":"Computer setup, electricity consumption"},"content":{"rendered":"

Published on:<\/strong> 01.08.2017<\/p>\n

My current computer setup (in 8\/2017) is
\nApple MacBook laptop “Core 2 Duo” 2.4 GHz 13-inch<\/a> with
\nDell 24-inch UltraSharp Monitor – U2412M<\/a><\/p>\n

Conclusion<\/h3>\n

I was surprised how little electricity is used by computer and monitor.<\/p>\n

All together it is maximum of 50 Watts, so for 1 kilo Watt hour, 20 hours of work is needed.<\/p>\n

I remember how CRT 15 inch monitor was using 70 Watt.<\/p>\n

Pentium 3 was using 55 Watt and Pentium 4 was using 130 Watt, at 100 CPU.<\/p>\n

Even my 19 inch HP L1950g<\/a> is using 30 Watt.<\/p>\n

What is much more than 24 inch and it is much smaller than 24 inch.<\/p>\n

Planned obsolescence from Apple<\/h3>\n

In MacBook I have 10 GB of DDR3 1067 MHz memory.<\/p>\n

Originally I had 4 GB but that was too little, so I had idea to put 16 GB inside 2x 8GB.<\/p>\n

But, for ever reason (I think that Apple have some software\/hardware lock, so that you need to buy new laptop and can not just install more memory) 2x 8 GB did not work, I could not boot it.<\/p>\n

With try and error, I found that if I leave original 2 GB in one slot and put 8 GB in another slot that it is working fine and that is how I have 10 GB.<\/p>\n

Basics of electricity consumption<\/h3>\n

This will just be basic introduction to electricity consumption, so that you can understand what is Watt.<\/p>\n

For electricity consumption you always have two parts:
\n – electric current, it is measured in ampere
\n – voltage, it is measured in volt<\/p>\n

To get electricity consumption you need to multiply electric current(ampers) with voltage(volts).<\/p>\n

Unit of measurement for electricity consumption is called Watt.<\/p>\n

Usually electrical devices are rated in Watt\/hour, what just means how many watt will some device use in 1 hour of their work.<\/p>\n

Electricity consumption of monitor<\/h3>\n

Electricity consumption of monitor depend on how white\/bright is your screen.<\/p>\n

So you can separate it by brightness and main color of screen.<\/p>\n

Table show some real measurements.<\/p>\n\n\n\n\n\n
Main Background Color<\/strong><\/td>\nBrightness<\/strong><\/td>\n<\/tr>\n
0%<\/td>\n75%<\/td>\n100%<\/td>\n<\/tr>\n
White<\/td>\n10.9 Watt<\/td>\n20.3 Watt<\/td>\n22.7 Watt<\/td>\n<\/tr>\n
Black<\/td>\n8.2 Watt<\/td>\n17.3Watt<\/td>\n19.9Watt<\/td>\n<\/tr>\n<\/table>\n

More brightness use more electricity, same is with white color.<\/p>\n

I also have tested contrast, but contrast does not have big impact.<\/p>\n

With brightness and contrast set to 0%, electricity consumption was 7.9 Watt, regardless of background color.<\/p>\n

But with brightness and contrast set to 0%, you just have black screen with just small back-light, so it is not useful.<\/p>\n

With brightness and contrast set to 100%, electricity consumption for white color was 22.9 Watt and for black 19.9 Watt.<\/p>\n

I have my monitor brightness and contrast set to 75% and electricity consumption was never above 20 Watt.<\/p>\n

When Flurry screensaver<\/a> is running it is 17.6 Watt.<\/p>\n

For one kilo Watt to be used, with biggest possible consumption of 20 Watt, monitor need to be on for 50 hours.<\/strong><\/p>\n

Electricity consumption of MacBook<\/h3>\n

MacBook is laptop, so it has a screen, but screen brightness had little effect on electricity consumption.<\/p>\n

Maximum difference between 0% and 100% brightness was 4 Watt and this was at load of 100% CPU.<\/p>\n

When CPU load was at 10%, when computer is not in active use, difference was at 2-3 Watt.<\/p>\n

Table show some real measurements.<\/p>\n\n\n\n\n\n\n
Test<\/strong><\/td>\nBrightness<\/strong><\/td>\n<\/tr>\n
0 %<\/td>\n100%<\/td>\n<\/tr>\n
CPU 10%<\/td>\n15 Watt<\/td>\n17 Watt<\/td>\n<\/tr>\n
CPU 100%<\/td>\n28 Watt<\/td>\n32 Watt<\/td>\n<\/tr>\n
Flurry screensaver<\/td>\n8 Watt<\/td>\n20 Watt<\/td>\n<\/tr>\n<\/table>\n

My regular work is at 25% CPU.<\/p>\n

As it can been seen from table, main part of electricity consumption in computer is CPU load.<\/p>\n

All this measurement as done with Dell 24-inch monitor connected to MacBook.<\/p>\n

I did same measurement with Dell 24-inch monitor disconnected, difference was just in 2-3 Watt.<\/p>\n

Electricity consumption some of my other equipment<\/h3>\n

iPhone 4<\/a> use 10 Watt to charge Battery from 0% to 100%.<\/p>\n

iPad Retina Mini<\/a> use 35 Watt to charge Battery from 0% to 100%. After 20 charging that is 1 kilo Watt, what I spend per month and I use it every day few (around 3) hours.<\/p>\n

Additional explanation of measurements<\/h3>\n

I have used Velleman NETBSEM5 ENERGY METER<\/a> for measuring electricity consumption.<\/p>\n

For white Main Background Color I used https:\/\/www.google.com<\/a>.<\/p>\n

For black Main Background Color I used http:\/\/www.blackle.com\/<\/a>, look-like they really save electricity.<\/p>\n

To get CPU at 100%, just yes > \/dev\/null &<\/a><\/code> was used.<\/p>\n","protected":false},"excerpt":{"rendered":"

Published on: 01.08.2017 My current computer setup (in 8\/2017) is Apple MacBook laptop “Core 2 Duo” 2.4 GHz 13-inch with Dell 24-inch UltraSharp Monitor – U2412M Conclusion I was surprised how little electricity is used by computer and monitor. All together it is maximum of 50 Watts, so for 1 kilo Watt hour, 20 hours […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":"My computer setup with electricity consumption #computerSetup #Apple #MacBook #electricityConsumption","jetpack_is_tweetstorm":false},"categories":[26],"tags":[11],"jetpack_featured_media_url":"","jetpack_publicize_connections":[],"yoast_head":"\nComputer setup, electricity consumption - Sasa Buklijas<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/buklijas.info\/blog\/2017\/08\/01\/computer-setup-electricity-consumption\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Computer setup, electricity consumption - Sasa Buklijas\" \/>\n<meta property=\"og:description\" content=\"Published on: 01.08.2017 My current computer setup (in 8\/2017) is Apple MacBook laptop “Core 2 Duo” 2.4 GHz 13-inch with Dell 24-inch UltraSharp Monitor – U2412M Conclusion I was surprised how little electricity is used by computer and monitor. 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