Power servant

The Power servant,^[1] also called energy servant^[2] or energy slave,^[3] is a unit of input power equal to 100 watts.^[4]

Humans eat roughly 2000 food calories a day. A calculation^[5] shows that this is almost exactly 100 W. This means that 100 W (100 joules/second) can be thought of as the amount of primary energy necessary to feed a person in a day. This energy/time gives a power (power is how fast energy is used) that is more personal than watts. Power servants are almost always used for per capita power consumption.

Another calculation^[6] shows that one tonne of oil equivalent per year of power use is approximately 13 power servants. One barrel of oil/year is 1.8 power servants.

The simulation below shows how many power servants (primary power per person) different countries use to serve different sectors.

References

↑ J.M.K.C. Donev noticed in 2015 that the more commonly used energy servant and energy slave were in fact units of power so changed the name to power servant
↑ R. Wolfson, "High-Energy Society," in Energy, Environment and Climate, 2nd ed. New York, U.S.A.: Norton, 2012, pp. 20–21
↑ This term is attributed to R. Buckminster Fuller's cover article of Fortune Magazine 1940.
↑ This causes some confusion as the watt is usually a unit of output power rather than input power like the calorie.
↑ $\frac{2000 Calories}{1 day}\times\frac{1 day}{24 hours \times 60 minutes \times 60 seconds}\times \frac{4184 Joules}{1 Calories}$ $=96.85 \frac{J}{second}=96.85 W \approx 100 W$
↑ $\frac{1toe}{1 year}\times\frac{1 year}{365 days \times 24 hours \times 60 minutes \times 60 seconds}\times \frac{ 41868000000 J 4184 Joules}{1 toe}\times\frac{1servant}{100W}$ =13.29 power servants $\approx 13$ power servants

[1] J.M.K.C. Donev noticed in 2015 that the more commonly used energy servant and energy slave were in fact units of power so changed the name to power servant

[2] R. Wolfson, "High-Energy Society," in Energy, Environment and Climate, 2nd ed. New York, U.S.A.: Norton, 2012, pp. 20–21

[3] This term is attributed to R. Buckminster Fuller's cover article of Fortune Magazine 1940.

[4] This causes some confusion as the watt is usually a unit of output power rather than input power like the calorie.

[5] $\frac{2000 Calories}{1 day}\times\frac{1 day}{24 hours \times 60 minutes \times 60 seconds}\times \frac{4184 Joules}{1 Calories}$ $=96.85 \frac{J}{second}=96.85 W \approx 100 W$

[6] $\frac{1toe}{1 year}\times\frac{1 year}{365 days \times 24 hours \times 60 minutes \times 60 seconds}\times \frac{ 41868000000 J 4184 Joules}{1 toe}\times\frac{1servant}{100W}$ =13.29 power servants $\approx 13$ power servants

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Power servant

References