faradayfan
Newbie level 4
voltage drops
I don't really understand the concept of voltage drops in a resistor at the physical level. I was looking into voltage dividers and I was surprised to learn that it is not the value of the resistor in ohms that determines the voltage drop but the resistors proportion of the total resistance in the circuit. If power is dissipated in a resistor should it not be in proportion to how great the resistance is regardless of how much resistance there is in the rest of the circuit? Is it the fact that only the total resistance is what is instantly 'seen' by the electrons flowing have anything to do with this?
Also I don't understand how at the physical level voltage goes down after going through a resistor. The electrons hit atoms and thus are slowed down, but how does that translate into lower voltage? Isn't voltage at the physical level just a measure of the difference in the amount of electrons on each side of the resistor, and if that is true and the same amount of current flows out of the resistor as into it, shouldn't the voltage be the same on both sides?
I don't really understand the concept of voltage drops in a resistor at the physical level. I was looking into voltage dividers and I was surprised to learn that it is not the value of the resistor in ohms that determines the voltage drop but the resistors proportion of the total resistance in the circuit. If power is dissipated in a resistor should it not be in proportion to how great the resistance is regardless of how much resistance there is in the rest of the circuit? Is it the fact that only the total resistance is what is instantly 'seen' by the electrons flowing have anything to do with this?
Also I don't understand how at the physical level voltage goes down after going through a resistor. The electrons hit atoms and thus are slowed down, but how does that translate into lower voltage? Isn't voltage at the physical level just a measure of the difference in the amount of electrons on each side of the resistor, and if that is true and the same amount of current flows out of the resistor as into it, shouldn't the voltage be the same on both sides?