Deep Dive: T6A01
The correct answer is B: Resistor. A resistor is the electrical component that opposes the flow of current in a DC circuit. Resistance is the property that limits current flow, and resistors are components designed to provide specific resistance values. Resistors are fundamental components in electronics. They oppose current flow by converting electrical energy into heat. The amount of opposition is measured in ohms (Ω). Resistors are used to limit current, divide voltage, provide bias voltages, and many other functions. In DC circuits, resistors provide constant opposition to current flow, following Ohm's Law (E = I × R). Understanding resistors is essential for all electronics work.
Why Other Answers Are Wrong
Option A: Incorrect. Inductors oppose changes in current (AC reactance), not steady DC current flow. Inductors have very low resistance to DC current. Option C: Incorrect. An inverter converts DC to AC, it doesn't oppose current flow in a DC circuit. It's a power conversion device. Option D: Incorrect. Transformers transfer AC energy between circuits, they don't oppose DC current flow. Transformers don't work with DC.
Exam Tip
Resistor opposes DC current. Remember: Resistors are components that oppose the flow of current in DC circuits by providing resistance, measured in ohms.
Memory Aid
**R**esistor = **R**esists **C**urrent (think 'R = RC')
Real-World Example
You're building a simple LED circuit. You need to limit the current to protect the LED. You add a resistor - it opposes the current flow, limiting it to a safe value. The resistor converts excess electrical energy into heat, protecting your LED while allowing proper operation.
Source & Coverage
Question Pool: 2026-2030 Question Pool
Subelement: T6A
Reference: 2026-2030 Question Pool · T6 - Electrical components
Key Concepts
Official Pool Source
Question text and answer key are synchronized with the current NCVEC Technician Class pool and mapped to the T6A topic.