Question 1 of 10
What type of semiconductor junction is found in an LED?
LEDs are based on a PN junction formed by joining p-type and n-type semiconductor materials.
Question 2 of 10
In which direction does current flow to cause an LED to emit light?
LEDs emit light when current flows in the forward biased direction, from anode to cathode.
Question 3 of 10
What is released when electrons and holes recombine in an LED?
Light (photons) is emitted when electrons and holes recombine in the PN junction of an LED.
Question 4 of 10
What does the color of light emitted by an LED depend on?
The color of light depends on the semiconductor material and its bandgap energy.
Question 5 of 10
Which of the following is a key advantage of LEDs compared to incandescent lamps?
LEDs are known for their high energy efficiency and low power consumption.
Question 6 of 10
What is the typical lifespan of an LED?
LEDs typically have a long lifespan, often lasting for tens of thousands of hours.
Question 7 of 10
Which terminal of an LED is connected to the positive side of the power source when forward biased?
The anode (p-type) of an LED is connected to the positive side for forward bias.
Question 8 of 10
Which of these is NOT a common application for LEDs?
LEDs are replacing incandescent bulbs in many applications.
Question 9 of 10
What type of energy conversion occurs within an LED?
LEDs convert electrical energy directly into visible light.
Question 10 of 10
What happens to the electrons and holes when they meet at the PN junction?
Electrons and holes recombine, releasing energy in the form of photons (light).
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