I know it may be a little late to give an answer here but I'll give one anyway.
Resistors are just as described as they are named resistors for that reason.
Resistor is made of a particular substance of matter that allows a certain amount of current to flow through it despite the voltage sitting at one side of the lead.
Some substances are more conductive and resistant than others, and allow A particular amount of the voltage's current to pass through it's substance.
Here's an example given,, 12 Volts sitting at one side of a resistor and its substance that is made of, will only allow a certain amount of current of the 12volts to pass through it.
depending on the amount of current running through it, can cause friction at the molecular level creating to generate heat as heat disperses outward through the substance and matter.
The higher the voltage sitting at one side of a given substance that can only handle a certain amount of current due to its resistant properties will allow it to flow through it at a certain rate of speed.
It depends on the substance versus the voltage to how much current will be allowed to pass through.
The more the voltage the more that the current will try to attempt to push through the substance of matter causing friction.
Basically pushing too much current through a substance not rated for it, meaning it can't handle it will generate heat and if that heat is generated faster than the substance of matter will allow it, will can cause the movement of heat to back up cuasing pressure at a given point spending the properties of the substance of matter.
If the heat cannot disburse at a proper rate,, it will build up within the circuits substance and once it reaches throughout the entire circuit to the outer most limit of it's substance now coming in contact with air to convect through it will cause the heat to not be able to convect so well into the air backing up the heat to create pressure within the substance of the circuit,, raising the temperature to burn it out and spend its functional properties.
The functional properties the allow the passing of current from voltage.
If heat cannot disburse quickly enough in a given substance it will build up to build pressure creating higher temperatures that spend properties of a substance pretty much killing the properties that allow current to flow through it. Which is why you get blown circuit when you want to much voltage through them.
They can burn up to where there is no visible signs of damage,, all the way up to completely burnt black looking
If you want to understand current and ohms for resistance.
Think about how fast you will think and quicksand as verses sinking in a pool of water. The quicksand has more resistance obviously under your same weight having more friction and resistance causing you to sink slower.
Water has less resistance and you will sink much faster under the same weight of your body.
You can say the weight of your body is the voltage.
And the substance "quicksand" Will allow your weight being the voltage to pass through at a certain rate.
It's much the same example as I read above from the guy Russell M. With his example,which is a great example.
You can try reading up on thermodynamics as that ties into it as well. After all it is physics, and different aspects of physics have a hand-in-hand relationship with one another. As energy can be neather destroyed nor created but given from one form to another. Such as Connetic energy can cause A substance of matter to move in motion of velocity to come in contact with another substance rubbing up against it to cause friction causing heat energy. Now Connetic Energy just became heat energy.
So basically a resistor is just as his name is named resistor because it resists electrical current As that is what its job is to do.
The rating of ohms is what the resistor can handle. The higher the rating of the ohms more resistance it will have to resist higher Voltage.
it's hard to read about it and understand it from a book or text.
It is always best to learn from somebody who visually understands it,,,, or you could just go on YouTube and watch some videos there that explain how resistance and a resistor works,, that would be easier.
Hope that was of help and help to anyone in the future reading this?
if anybody sees any mistakes that I made with explaining this? please feel free to correct me in anyway.
Thank you so much