# diode

/ˈdaɪˌoʊd/ (US) · /dˈaɪəʊd/ (UK) · CEFR C1 · Noun

Source: https://englishreference.com/word/diode
Updated: 2026-05-09

## Definition

a small electronic part that only lets electricity flow in one direction. It works like a one-way street for power in a circuit.

For teachers: a two-terminal electronic component that conducts current primarily in one direction, characterized by low resistance in one direction and high resistance in the other.

## Examples

- The light-emitting diode on the panel turned red.
- A diode is used in the power supply to convert alternating current into direct current by blocking half of the signal.
- Modern circuit design relies heavily on the semiconductor diode to protect sensitive components from reverse polarity, ensuring that current flows only along the intended path.

## Usage notes

- Often appears in the compound 'light-emitting diode' (LED).

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