Question

How does a resistor affect the current in an electrical circuit?

Answer 1

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Answer 2

over the resistor will be a voltage drop if a current goes through. I am speaking of normal resistors, not superconducting, or isolators.

Answer 3

so the flow of electrons have a lower energy after it passed the resistor.

Answer 4

In the most general case, you can say resistor will oppose electrical current, but that is not to say adding a resistor will cause current to decrease....for example adding a resistor in parallel to a group of resistors connected in parallel will cause the total current to increase. To predict whether current will increase or decrease you must know the circuit configuration.