Let's start off with what moves around, that is current. The truth about current is quite complicated as it has many definitions, but we will define it in a simple way because this is more of an introduction to electronics.
We will define current as the amount of electrons that flow through a conductive material such as a wire in a certain amount of time, for this the unit of measurement is A for Amps but the magnitude is indicated with a capital "I" for Intensity. The current does not flow on it's own, what causes current to move is what we call Voltage, it's like the energy that the current has, the unit of measurement is V for Volts. Now that we have defined Voltage and Current we can define Resistance, which is the opposition to the current. As the name states, it resists the flow of the current causing it to have a drop of voltage, the unit of measurement is Ohm which uses the Greek character Omega Ω.
Now that we have defined these three factors we can continue on to learn about Ohm's law which states that current is directly proportional to voltage and inversely proportional to resistance, as in, if the voltage increases the current will increase as well, while on the other hand if the resistance increases in consequence the current will decrease. The formula to Ohm's law looks more like this: V/Ω=A which you will inevitably see everywhere in the world of electricity and it's properties.
With the information we have learned up to now we can construct our first circuit which will have a source of power of 12 Volts and 2000 Ohms or 2KΩ for short. You may be wondering where our current is, that is exactly what we are about to calculate using Ohm's law!
By dividing 12V by 2KΩ we get 0.006 Amps or 6mA for short. This means that 12 Volts of energy are lost during the flow of 6 miliAmps of current through a 2000 Ohm resistor. That is quite simple for now, but this is an introduction so it should be. Plus! I have more posts planned for the subject of electricity and it's properties.
As a final statement I would like to say that I am still in school and I am quite fascinated by electronics so if I made any mistakes on how these things work I ask that you please understand and that you tell me in the comments so that I can correct any wrong information. Thank you for reading and I hope to see you in the next post which will be about resistors and how we can put them together to create larger or smaller amounts of resistance.