Where and how do ghosts derive the energy needed to move objects, speak, or show themselves?
They are no longer corporeal; consuming food is a breaking-down of nutrients to generate energy, and they no longer have this ability.
Still, performing the simplest act requires expending energy to accomplish the task, and the laws of physics apply; the greater the task the more energy needed to carry it out. When these entities move or throw objects, they require the same amount of energy as a human performing the same task.They appear to possess several options. First is the common cold spot. Many hauntings are accompanied by cold spots, areas where the air is colder than the surrounding environment. This can apply to both indoor and outdoor locations. I have experienced both.The amount of power at their disposal is limited by three factors: the physical size of the cold spot, the intensity of the temperature drop and the duration of time of the temperature drop. Below is a table of approximately how much energy would be at an entity’s disposal for a given temperature drop of over 1 hour for an area of one square foot 12"x12"x12", an area 5'x5'x5’, and an area 8'x8'x8’.
1 square foot
temperature drop 1 degree = .322 watts
temperature drop 5 degrees = 1.61 watts
temperature drop 10 degrees = 3.22 watts
temperature drop 15 degrees = 4.833 watts
temperature drop 20 degrees = 6.44 watts
temperature drop 1 degree = 40.25 watts
temperature drop 5 degrees = 201.25 watts
temperature drop 10 degrees = 402.5 watts
temperature drop 15 degrees = 604.125 watts
temperature drop 20 degrees = 805 watts
temperature drop 1 degree = 164.864 watts
temperature drop 5 degrees = 824.32 watts
temperature drop 10 degrees = 1648.64 watts
temperature drop 15 degrees = 2474.496 watts
temperature drop 20 degrees = 3297.28 watts
You need to take into account that almost no cold spot lasts for one hour, so these numbers can be scaled down by dividing these figures by 60 to get a duration of one minute, or scale them to any duration. This brings up another possibility -- the energy from small temperature drops might be stored up over a long period of time. Also unknown is whether ghosts consume power when performing no task, just existing, or if there is a loss of energy through inefficiency converting this power source to usable energy.
Expending energy in human terms is listed below.
Humans in good fitness average 100 watts of power output per hour.
A pitcher throwing a 90mph fastball expends 117 watts of power.
I have seen these entities throw objects that might get them a contract in the major leagues, but these were isolated occurrences. It would appear that after expending large amounts of energy, a period of inactivity will follow. When I have witnessed more than one object being moved on the same night, there was at least an hour between events.
There have been instances of multiple scratching attacks directed toward humans on the same night, but estimating how much energy was require is difficult to estimate.
Option 2: Drawing energy from batteries. Ghosts are notorious for draining batteries from equipment. I have often wondered why ghosts drain batteries when a property has electrical power as a source to tap. It might be AC current is unavailable to them. I have seen fresh batteries drained completely even before they were placed into the device -- DC current seems an easier source of energy. Below are battery energy storage capacities of commonly used batteries. (Remember sometimes they will drain 2, 3 or 4 etc. of these at a time).
9V battery 400-1200 mAh
D battery 8,000-18,000 mAh
C battery 3,800-8,000 mAh
AA battery 1,000-3,000 mAh
AAA battery 540-1,250 mAh
A third option, hot spots. where the temperature increases, could be generating power through a reverse means, or it might be an entity having used energy is dissipated as heat into the surrounding air as a byproduct of its activity.
The fourth option is tapping directly into human energy. At some haunted locations people report feeling drained of energy, or experience ravenous appetite, even after having eaten shortly before. After looking over the numbers it is clear that enormous amounts of energy can be utilized for brief and sometimes violent outbursts of activity, but these activity levels can't be sustained. The greatest duration of activity I have ever documented was at Six Flags during an overnight ghost hunt. This entity powered up my camcorders halogen night light. It was able to provide power for nearly two minutes, most paranormal events last just a few seconds.