Watching a large television for 5 hours

CO2e: 0.18kg (3 hours)

http://michaelbluejay.com/electricity/howmuch.html gives

55-90 watts 19″ television

Assume large TV is 100 watts.  5 hours is 18000 seconds. Electrical energy is 100 * 18000 joules or 1.80 megajoules. This creates 0.18 Kg CO2.

A desktop computer on standby for 16 hours

CO2e: 0.03 Kg (50 mins)

mrzonbu.wordpress.com says

“What I discovered, after the Kill-A-Watt was in place, is that my PC is sucking back 6 watts of power just idling in standby mode. Wow. Thats only mildly less than the low end (8 watts) of what PC Magazine said their Zonbu unit was drawing while in use.

“Put in perspective, it sounds like replacing my desktop PC with a Zonbu for the 80% of the time I’m using my PC for web browsing would allow me to cut my energy usage for that same period to 1/10th of my current load. Moreover, depending on what the standby load is for the Zonbu, I may be able to experience similar savings when in standby (most of the day while I’m at work and all through the evening).”

For CO2 from electricity we have 0.1 Kg per megajoule.

Assume large TV is 100 watts.  16 hours is 57600 seconds.
Electrical energy is 6 * 57600 joules or 0.345 megajoules.

This creates 0.03 Kg CO2.

Desktop computer switched on for 8 hours

CO2e: 0.58 Kg (10 hours)

How do I find out how much electricity something uses?
http://michaelbluejay.com/electricity/howmuch.html says

140-330 watts, Desktop Computer & 17″ CRT monitor

Low power consumption PC’s:
http://www.yourpcholmfirth.co.uk/acatalog/Low_power_consumption_PC_s.html
“Asus, Build your own AMD Power Saving PC
Typical desktop computer uses about 85 to 250 watts. Yes, some computers
use more. Our power saving system consumes 55 watts on idle. In doing so
you are not sacrificing performance for typical home & small office activities – email,
web browsing & general office applications.”

A rough estimate might be 200 watts.

For CO2 from electricity we have 0.1 Kg per megajoule

Assume large Computer is 200 watts.  8 hours is 28800 seconds.
Electrical energy is 200 * 28800 joules or 5.76 megajoules.
This creates 0.58 Kg CO2.

Michael Bluejay also does specific computers:
http://michaelbluejay.com/electricity/computers.html

Configure my PC to Save Electricity – Queen’s University Belfast
http://www.qub.ac.uk/directorates/InformationServices/HowdoI/ConfiguremyPCtoSaveElectricity/

Why estimate when you can measure?
http://www.codinghorror.com/blog/archives/000353.html

An average TV on standby for 19 hours

CO2e: 0.12 Kg (2 hours)

http://www.tvec.org.uk/Energy_calc_2.asp give

TV, 49watts  (on), 13 watts  (standby)

For CO2 from electricity we have 0.1 Kg per megajoule

Assume TV on standby is 13watts.  19 hours is 72000 seconds.
Electrical energy is 13 * 72000 joules or 1.15 megajoules.
This creates 0.12 Kg CO2.

But for several different answers see http://uk.answers.yahoo.com/question/index?qid=20070716040535AARuwNB&show=7

Watching a small television for 5 hours

CO2e: 0.09kg (1 hour 40 mins)

Watching a small television for 5 hours.

http://michaelbluejay.com/electricity/howmuch.html gives

55-90 watts, 19″ television

For CO2 from electricity we have 0.1 Kg per megajoule

Assume small TV is 50 watts.  5 hours is 18000 seconds.
Electrical energy is 50 * 18000 joules or 0.90 megajoules.

This creates 0.09 Kg CO2.