# Why does a resistor decrease the current flowing in a circuit if this is what current is?

This is what I know, please tell me if I am wrong: An electron has an elementary charge (let’s call that charge e). A current is defined as the amount of e (elementary charge) that flows past a point in a circuit in one second. Now, why does the amount of current passing through a resistor decrease as its resistance increases? The electrons still have the same elementary charge after passing through the resistor right? Does that mean that the electrons move more slowly so that the amount of charge passing in one second decreased?

• Hint: if the resistor is connected to an (ideal) current source, the current through the resistor doesn't decrease as the resistance increases, the voltage across the resistor increases instead. Jul 25, 2017 at 21:22
• @AlfredCentauri okay and that decreases the current ? my knowledge in physics doesnt pass that of a 9th grader so please explain. Jul 25, 2017 at 21:29
• No, the current is completely unaffected by any change in resistance when the resistor is connected to a current source. This is the hint, i.e., increasing the resistance doesn't necessarily decrease the current through. Jul 25, 2017 at 21:42