*Question T6A01:
What electrical component opposes the flow of current in a DC circuit?*  

*Correct Answer is  B: Resistor*  

### AI Response: (may contain errors)  

In a DC circuit, the component that opposes the flow of current is a resistor. 

### Explanation of the Correct Answer:
- **Resistor (Correct Answer)**: A resistor is designed to limit the flow of electric current. It does this by providing resistance, which is measured in ohms ($\Omega$). According to Ohm's Law, the relationship between voltage ($V$), current ($I$), and resistance ($R$) is given by:
  
  $$V = I \times R$$

  This means that for a given voltage, increasing the resistance will decrease the current flow.

### Explanation of Incorrect Choices:
- **Inductor**: An inductor stores energy in a magnetic field when current flows through it. While it can oppose changes in current (due to its property of inductance), it does not primarily oppose the flow of current in a steady-state DC circuit.

- **Inverter**: An inverter is an electronic device that converts DC to AC. It does not oppose current flow; rather, it changes the type of current. 

- **Transformer**: A transformer is used to change the voltage level of AC signals through electromagnetic induction. It does not operate in DC circuits and does not oppose current flow in the same way a resistor does.

### Summary:
- The resistor is the component that directly opposes current flow in a DC circuit.
- Inductors, inverters, and transformers serve different functions and do not primarily oppose current flow in a DC context. 

Understanding these distinctions is crucial for the Extra Class exam and practical applications in amateur radio.