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Would it make sense for an entity who can control tangible and/or intangible materials be able to manipulate electricity but not light? Question
I have this idea about people with "Psionic" power. Psionics in my story are primarily beings able to emit and/or manipulate a special energy field from within that takes physical form. They can extend it outward to pick up various materials like picking it up with their own hands with approximately 3 to even 10 times the strength of their actual physical body depending on the individual. Everything they do affects their own body and if they go past their limit they can risk their bodies going through the same problems as if overdoing it in terms of exercising (fatigue, muscle aches, death via exhaustion, etc) and this energy can be used only in two forms; tangible and intangible.
Those that can affect tangible materials (rock, metal, etc) can either move it around or straight up crush it by applying pressure through their energy field. However, due to psionic energy being more equivalent to a physical extension of the body like an arm, the heavier the object the harder it'll be to hold onto it let alone pick it up and if it's granulated like sand for example the user will have to pick up the chunks of sand with some it dripping out or if they actually want to do anything with the sand they would have to pick up the individual grains of sand which runs the risk of tiring out the user depending on individual power and the portion of sand being used.
Those whose energy type affects intangible materials (gas, air, etc) can grab intangible materials including air (only small portions of the air though) and can condense it to a certain degree. However, the larger in body the amount of air or gas the psionic user tries to grab, the harder it is to maintain, as well as it becoming more strenuous to hold onto and condense. They also can't affect the individual gases when it's a mix like say for example how air is made out of oxygen, nitrogen etc, they can't separate or grab said individual gases.
One rule I especially wanted to set up is that regardless of what said psionic energy user affects, they can't grab light with their psionic energy, period, simply because I felt it would be a little too much in terms of power.
The problem is I did want to set it up where psionic energy can affect electricity (grab it, condense it etc) and wanted to set it up where the user can only affect electricity from outside sources such as from a taser or a fusebox so no grabbing and moving electrons.
So now I'm left wondering: does it make sense that psionic energy can be used to grab electricity but not light, let alone if there is a way to make sense of it? After all, light and electricity are practically the same thing (energy). They aren't exactly one of the three states of matter (solid, liquid, gas) and I don't want to use the excuse of it being too overabundant to simply grab with psionic energy since intangible users can grab air in small portions (which is everywhere).
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Your psionic energy make little sense as we currently understand physics. Since you're making up the rules, it can do whatever you want. You are in effect asking "When I totally ignore the laws of physics, how can I use the laws of physics to explain ...?".
Another point is you might want to pick different names for what you call tangible and intangible. Gasses aren't intangible in the normal sense of that word, any more than solids or liquids are.
If you want to make up an absurd world, that's your business. However, you might care because the more absurd, the more you lose readers. You run the risk of it being insulting to anyone with a high school science background: "I think you're so dumb you'll believe anything.". You'll come across as the proverbial flaky artist who never understood all that science stuff. In the end, flaky artists will be the only readers left.
If you're going the really absurd route, just go ahead and call it magic. That way you're not pretending any of it is supposed to make sense.
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Swap too much control for too little
If your concern is that being able to control light would make your character(s) too powerful, but you feel that not affecting light would seem like an oversight, you could consider making their effects on light undesirable - a weakness rather than a strength. You already have powers that become unstable when a psionic tries to do too much:
However the larger in body the amount of air or gas the psionic user tries to grab, the harder it is to maintain, as well as it becoming more strenuous to hold onto
For example, a character may want to be stealthy, subtly affecting the electronics of a building in order to gain entry (perhaps by interfering with a security circuit or the power to an electromagnetic lock), but they cannot control the side effects. These may include electronic side effects, such as also affecting other nearby circuits, perhaps making all the lights in the building flicker on and off, or even directly affecting the path of the light already present, such as streetlight or moonlight. The building and its surroundings could appear to bend and distort as the light from it deviates from its usual straight line paths, almost like seeing something underwater.
To uninformed observers, this could be scary but meaningless, but to those experienced with dealing with psionics this would be an unmissable sign that someone is manipulating electricity nearby. As it affects the path of electromagnetic radiation directly, this distortion would also show up on cameras, whether security cameras or the smartphones of curious observers. Even if the owners were not expecting the building to be a target, news outlets and social media would soon make the side effects known around the world, making significant use of psionic power very risky for someone wanting to remain hidden.
All that power is only an advantage if the psionic can keep it concealed. They have little chance once they are known - they won't last long against a trained team in head to toe Faraday armour.
Extending out from the visible electromagnetic spectrum
Unless your story requires this to only be a visible light effect, you could also have side effects that change the path of other electromagnetic radiation.
- A psionic manipulating electricity in a hospital could cause x-rays taken in nearby rooms to be distorted.
- Random deviation of infra-red could makes parts of a room suddenly feel warmer or cooler when a psionic is operating in a nearby room ("I felt the room go cold. We were close").
Proportionate size side effects
More powerful psionics may have a wider range of abilities, but less ability to hide or control their use, with a wider range of side effects. The size of the side effects may be in proportion to the amount of control exerted. At full power, the side effects may be so severe that the psionic cannot see what they are doing through all the light distortion, making their power a blunt instrument with no control over what it affects.
Large amounts of influence over electricity may cause large side effects, but even very small changes may cause large side effects if they require precision. Changing a value stored in a computer may require only a tiny amount of electricity at the point of change, but a huge amount of control to prevent surrounding stored values also changing. Wiping an electronic storage device could be easy, with little side effects, but changing a single value without leaving evidence of tampering could be very difficult, require years of practice, and still cause large widespread side effects in the surrounding environment - a light show that defeats the purpose of concealing the tampering if anyone is nearby to see it.
Side effects even when not actively using power
There may even be small side effects just from the presence of a psionic, even when they are not trying to use their abilities. Stilling their powers completely may take deep concentration, meaning outside of that state they can be tracked and detected by their effects on things like magnetic compasses and digital displays (computer screens, phone screens, information screens in shops, airports, train stations, bus stops), and sometimes even subtle deviations in the path of ambient light, looking like the shimmer of distorted light over a hot road.
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Yes, you can make sense of it: mass
The property you are searching for is "mass". All the matter you describe as tangible and intangible is matter with mass ("particles"). Also electricity can be considered as being a flux of electrons which itself have a mass (albeit really small).
Light on the other hand, is considered to be carried by electro-magnetic waves - or for simplicity: photons - which are considered to be massless.
The psionic forces thus can be based on a fundamental principle of manipulating mass-carrying particles of matter. This is something like a "gravitational force" but not quite the same: Only as a construct of explanation like in Newtonian rules of physics "only" - "gravitational force" is a simplification here, because gravitation actually describes the observable effect of matter moving in bent spacetime in our current understanding of physics - therefore gravity itself is/would be able to influence light as well.
Sidenote: If you consider the term "energy" to comprise electricity and light, this can be considered an (over-)simplification. They might be a form of energy but so is mass as well (mass-energy-equivalence). I won't go into details here in the scope of the question.
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