How to write a fantastic story novel realistic - Let your readers understand the magic in your story

I have a little problem with the fantastic stories. Now you do not understand me wrong, the fantasy of my favorite genres. My question is more or less inconsistent with fantastic stories generally, but told in stories and especially the authors of such stories.
The problem I have is: Responsibility.
When I read a fantastic story, I want explanations, I want reasons. I do not want something to happen, just because the author could do it. If using a wizard, magic, will, I would like to know where the hell has the magic, and why he's able to use it.
I'm tired of reading a story where a magician throws a ball of fire, only because he used magic. Where does this magic come from? What are the rules of magic? A world that is not our world, much the same rules we are subject. . And as we all know from science class: a Newton's laws of motion states: "For every action there is an equal and opposite reaction"
This law of motion is applied when a specific action is immaterial for all actions in life. You think of something that will remind you usually think of something else. Just open your eyes the morning, triggering a series of other measures.
Just because someone does in a fantasy world is not that these laws do not exist. Naturally, perhaps in another world, he will be three moons, the breath of the population in nitrogen, to survive, is the severity easier and fireballs can be trained to be to whisper a word is not, not the laws of science do not exist.
A different world can have differences, but he always follows the same laws of science like any other world. Magic can still exist, but the rules must be defined, and these rules need to respect the laws of science.
Say for example, an assistant who has the power, although of God comes into this world. I do not believe in the gods, but when your world is a God or gods, and from them comes to power, it might be a good idea, some sort of statement about how God gives strength have to be the wizard. How to earn God power?
The problem of the energy from Gods opens a whole series of problems. Believers of God in your world thinks they know everything, and "only" have the power. Thus, the scene of your world and the reader is immersed in it was, you have to and probably do not explain how God has the power. For me it's a bit annoying that I'm the kind of person who know where this stuff is like.
But if not we understand this in our own world, it can harm, if they explain in a fictitious world, at least try not without destroying the world stage, a writer introduced.
But you know what I say. There must be accountability in a world. It may not be easy, what happens because of the "Magic". It must be rules, declarations, just as the reader knows that things not be "just so".
, I realized that I do the same thing, I had my. I have fantastic stories in which magic was thrown around. Later I read and found in shallow and carry the story. Later, when I wrote and told me a little bit of magic, I found it for me, more tangible, realistic and exciting.
Lets run through a quick scenario. I will develop a source of magical rules.
Well, come here where our magic?
Call it a source of energy that exists in the world. But where does this energy source? Well, we all know that everything is energy. Science has proven that right. Well, in simple terms one could say that the people in the world are sensitive to energy. This was proven in our world. Some people are sensitive to movements of energy in our world. Have you ever been anyone you see in the distance, and you have felt, so you turned around and found one. Well, it is our natural sensitivity to energy shake.
There are some people more sensitive in our world, that can pick up on the features of energy. We still have nobody extremely sensitive, but we did not make the people in our world, very sensitive, and it can handle the thoughts, rather than devices.
If we wanted a bit more complicated, we could say that there is a large disturbance, the energy from. We have this in our own world, the North and South Poles. Now he turned a thousand times greater. Maybe it's the energy that people have access to our world. But we must ensure that when the remotest possibility of our world are limited, that their access is.
See, we have to do with the laws of our science magic. Well, that is the source of our energy and declare, "magic" comes from. You can continue to develop such rules as it is used and manipulated. Perhaps the people use the magic can only send bolt of lighting. Or they can use the energy to magnetize and attract metal objects, they are magnetized their magnetic poles reverse and send the metal rose like a ball rolling down.
Perhaps with any other materials they can use to create magic fireballs. To create a ball of fire in our world, we say that magicians to collect sawdust mixed with a little sulfur and metal grindings small magnetized to create a powder. They gather in their hands and lit the use of electricity, then send the fireball inverse pole use on the target.
Thus, with science, magic can seem tangible. Well, maybe all the magic that is otherwise explained by the people in your world. You can explain that the power of the gods. Through experimentation, they have learned to send flying fire balls. You may not know the real rules, how it works, but they have their own rules. So you have the real science behind the show, and you have what people think, the real science behind it.
Now the real challenge is to explain in what your readers seem real, but at the same time not to destroy your readers see the world.
Thus allows this problem to explore.
For example - and there are many ways to do this - this world, could we see a very discreet assistant, who have understood the magic in the true sense. He does not believe in gods and it was very intuitive and I wanted to know the true source of energy. He has the math. For example, a scene in your book too, but make sure it makes sense in the book and the real magic could be explained. How to make your players, two views on how the magic happens. This way, you do not destroy the magic, the people believe, but at the same time, it seems real to readers.
How to write a good story it needs to be accountability. "For every action there is an equal and opposite reaction". Do not throw things, and do not expect readers to question it, or it is not a reaction to computers in the story, or a consequence. This water is very shallow and unbelievable story.
Everything has a reason why it works.