Transistors in an op-amp:Amplification :: Resistors in a circuit:?

Transistors inside an op‑amp are the active parts that amplify signals by switching and controlling current flow. In a general circuit, resistors play the passive role of providing resistance, which limits current, sets voltage levels, and divides voltage. By placing resistors in series or parallel, you can shape the behavior of the circuit, just as transistors shape amplification. For example, a 1 kΩ resistor in series with a 10 kΩ resistor forms a voltage divider that outputs one‑tenth of the input voltage, showing how resistors set voltage and current levels. Thus, transistors amplify, while resistors regulate and control the electrical flow.