Difference between revisions of "Muscle power versus modern consumption"
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Revision as of 18:22, 23 May 2020
How much power can humans, and other animals, generate? How much do we consume?
Energy guru Vaclav Smil claims that trained individuals can generate 4 or even 5 KW of work for a few seconds, and almost 2 KW equivalent in sustained running.
However a practical experiment finds that an Olympic cyclist struggles to generate enough power to run a 700 W toaster for a couple of minutes:
One horsepower is defined as 745 Watts, and good horses can sustain 700—800 W of work power. Oxen, by comparison, may be capable of only around 300 W for smaller animals.
How much power do we use?
How does this compare with the amounts of power we are accustomed to using as part of a first-world lifestyle? Toasters are amongst the more power-hungry machines we use, along with others that produce heat such as kettles, dishwashers, washing machines, and heaters of course. Mobile phones, tablets and laptops, and modern energy-efficient LED lights use relatively little, although a dozen halogen downlighters draw almost as much as a toaster.
BBC TV's "Bang Goes The Theory" conducted a practical demonstration, showing how much electricity we use (and abuse!) without even thinking about it. This massive experiment attempted to power a house for an entire day solely through human pedal power, while the unsuspecting family inside went about their normal Sunday routine:
Spoiler: here's what happened when one of the family used their electric shower:
Electric showers are the most power-hungry electrical appliances we use in our homes, but anyone with a gas "combi" boiler uses three times as much whenever they run a hot tap to fill a bath, or when the central heating is running on a cold day.
Footnotes and references
- "Energy - A Beginner's Guide" by Vaclav Smil, Oneworld Publications, 2006 - 2017, ISBN 978-1-78607-133-0, page 71
- Smil, op cit, page 81