This section as for goal to present different energy conversion and examples1).
In every use:
Microscopic energy:
The energy of the sound is given by the equation: E = time (s) * area (m²) * intensity (W/m²) or E = time (s) * area (m²) * 10e(-12+db/10). For a person (1m²) absorbing the sound during one second:
The potential energy due to the gravitational field: E = mass (kg) * g (=10 m/s²) * deltaZ (m) Examples for lifting one object of 1m:
Levitation would need to generate a velocity of 9.8m/s each second. E = 1/2 m v² = 50J/kg. P = 50W/kg. The energy necessary to levitate for one minute for a standard person of 75kg would be 225kJ.
Kinetic energy due to velocity: E = 1/2 * mass (kg) * velocity² (m/s)
Energy release by the metabolism:
Chemical energy:
Let hypothesis that we don't want a combustible but just a source of heat and light.
For a candlelight:
light : 1 candela in all direction = 13 lumens = 2cW/s = 2cJ/s
heat: 80 W = 80 J/s
A person eat between 1500 kcal and 3000 kcal = 6-12 MJ, lets take 10 MJ
1 kg muscle (protein) = 17 MJ, 1 kg fat = 38 MJ, 1 Kg water at 37°C = 4.2 kJ/°C
Skinny person
50kg = 15kg muscle + 3kg fat + 2kg bones + 30kg water
Reserve energy = 15kg muscle + 3kg fat = 255 MJ + 114 MJ = 369 MJ
Water heat energy = 126 KJ/°C
Athlete
80kg = 40kg muscle + 8kg fat + 2kg bone + 30kg water
Reserve energy = 40kg muscle + 8kg fat = 680 MJ + 304 MJ = 948 MJ
Water heat energy = 126 KJ/°C
Fat person
100kg = 28kg muscle + 30kg fat + 2kg bone + 40kg water
Reserve energy = 28kg muscle + 30kg fat = 476 MJ + 1.1 GJ = 1,6 GJ
Water heat energy = 168 KJ/°C