Understanding LEDs

The video tutorial introduces LEDs, explaining that they are light-emitting diodes acting as one-way valves for electric current. It describes how diodes work, allowing current to flow in one direction and emitting energy as heat. LEDs, however, emit light instead of heat. The video demonstrates how to connect an LED to a battery and explains its applications in indication, communication, and illumination. It also covers how to use LEDs on a micro bit, showing how to control them with code to create patterns and images.

What does LED stand for?

• Light Emitting Device

• Light Emitting Diode

• Light Energy Diode

• Light Emission Device

What is the primary function of a diode?

• To store electrical energy

• To act as a two-way valve for electricity

• To convert electricity into light

• To act as a one-way valve for electricity

What happens when you reverse the wires on an LED?

• The LED will not turn on

• The LED will change color

• The LED will blink

• The LED will turn on

Which of the following is NOT a main application of LEDs?

• Communication

• Heating

• Illumination

• Indication

How do remote controls use LEDs?

• For cooling

• For heating

• For sending infrared signals

• For storing data

What spectrum of light do most remote control LEDs emit?

• X-ray spectrum

• Visible spectrum

• Ultraviolet spectrum

• Infrared spectrum

How many LEDs are arranged in a grid on the front of a micro:bit?

• 25

• 27

• 24

• 26

What is the purpose of the 'show LEDs' block in micro:bit coding?

• To turn off all LEDs

• To display a pattern on the LEDs

• To increase the brightness of LEDs

• To change the color of LEDs

What should you do after downloading your code for the micro:bit?

• Delete the file

• Turn off the micro:bit

• Restart your computer

• Drag the file to the micro:bit drive

What challenge is presented at the end of the video?

• To find the 26th LED on the micro:bit

• To write a new code for the micro:bit

• To build a new LED circuit

• To create a new LED pattern