Comparative energy consumption

Anyone with a mild obsession for energy consumption want to work out some handy conversions
zoara wrote on :

I saw something a while back that worked out that leaving a computer on sleep overnight used about the same energy as 30 seconds car travel at 40mph. Can't remember where and the figure was probably way out.

Anyone with a mild obsession for energy consumption want to work out some handy conversions between (say) leaving Apple laptops/desktops on sleep [1], boiling full kettles for just one cup of tea, leaving car engines idling, hoovering, and leaving the freezer open by mistake?

    -zoara-

[1] I presume there's a difference?

Rob replied on :

zoara wrote:

I saw something a while back that worked out that leaving a computer on sleep overnight used about the same energy as 30 seconds car travel at 40mph. Can't remember where and the figure was probably way out.

Anyone with a mild obsession for energy consumption want to work out some handy conversions between (say) leaving Apple laptops/desktops on sleep [1], boiling full kettles for just one cup of tea, leaving car engines idling, hoovering, and leaving the freezer open by mistake?

    -zoara-

[1] I presume there's a difference?

I read somewhere (can't find it now) that the Mini uses 2-3W - 'fraid I can't be any more mildly obsessive :-).

Rob

Elliott Roper replied on :

In article d7b7mo$87i$1@redacted.invalid, Rob removethisbitgramsci@redacted.invalid wrote:

zoara wrote:

I saw something a while back that worked out that leaving a computer on sleep overnight used about the same energy as 30 seconds car travel at 40mph. Can't remember where and the figure was probably way out.

Anyone with a mild obsession for energy consumption want to work out some handy conversions between (say) leaving Apple laptops/desktops on sleep [1], boiling full kettles for just one cup of tea, leaving car engines idling, hoovering, and leaving the freezer open by mistake?

    -zoara-

[1] I presume there's a difference?

I read somewhere (can't find it now) that the Mini uses 2-3W - 'fraid I can't be any more mildly obsessive :-).

If you accept 2.5W and you assume a car at steady 40mph eats 10KW (13.4HP), then a mini sleeping overnight (8 hours) is more like 7.2 second's travel. 72,000 Joules. That's 0.0004 at 5.6p per KWH At that price, your personal daily share of the world's sunlight is worth about 30,000.