LEDs Flashcards
(9 cards)
What does LED stand for?
Light Emitting Diode.
What is the main function of an LED in a circuit?
To emit light when current passes through it.
Why do LEDs need current-limiting resistors in circuits?
To prevent too much current flowing through the LED, which can damage it.
What happens if an LED does not have a current-limiting resistor?
It may receive excessive current and burn out.
Where is the current-limiting resistor placed in an LED circuit?
In series with the LED.
Can an LED be connected directly across a power supply?
No, because it may draw too much current and be damaged.
How can you identify the correct polarity of an LED?
The longer leg is the anode (+) and the shorter leg is the cathode (−).
Why is polarity important when connecting an LED?
LEDs only allow current to flow in one direction; reversing polarity stops the LED from lighting.
What are some common applications of LEDs?
Indicator lights, displays, and lighting.
