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Characteristics of diodes, lamps, thermistors, and LDRs

Electricity and circuits • Current, voltage, and resistance

Key concepts

What you'll likely be quizzed about

  • Diodes are semiconductor devices that allow current to flow in one direction only.
  • This unidirectional flow occurs because the diode's internal structure creates a potential barrier that restricts current flow in the reverse direction.
  • Diodes are commonly used in rectification circuits to convert alternating current (AC) signals into direct current (DC).

Flashcards

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What is a key characteristic of LED lamps?

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LED lamps are efficient and convert a large portion of energy into light rather than heat.

Key notes

Important points to keep in mind

Diodes only permit current in one direction.

Lamps can be incandescent or gas-discharge types.

NTC thermistors are commonly used for temperature sensing.

LDRs detect ambient light changes.

Use caution when elevating voltage on lamps.

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