Difference between revisions of "Muscle power versus modern consumption"
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− | How much power can humans, and other animals, generate | + | '''How much power can humans, and other animals, generate, and how much do we consume?''' |
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Energy guru Vaclav Smil claims that trained individuals can generate 4 or even 5{{sp}}KW of work for a few seconds, and almost 2{{sp}}KW equivalent in sustained running.<ref> | Energy guru Vaclav Smil claims that trained individuals can generate 4 or even 5{{sp}}KW of work for a few seconds, and almost 2{{sp}}KW equivalent in sustained running.<ref> | ||
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<youtube>S4O5voOCqAQ</youtube> | <youtube>S4O5voOCqAQ</youtube> | ||
− | One horsepower is defined as 745{{sp}}Watts, and good horses can sustain 700—800{{sp}}W of work power. Oxen, by comparison, may be capable of only around 300{{sp}}W for smaller animals.<ref> | + | One horsepower is defined as 745{{sp}}Watts, and good horses can sustain 700—800{{sp}}W of work power, so they could easily run a toaster. Oxen, by comparison, may be capable of only around 300{{sp}}W for smaller animals.<ref> |
Smil, ''op cit'', page 81</ref> | Smil, ''op cit'', page 81</ref> | ||
Revision as of 17:24, 23 May 2020
How much power can humans, and other animals, generate, and 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.[1]
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, so they could easily run a toaster. Oxen, by comparison, may be capable of only around 300 W for smaller animals.[2]
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.