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WorksheetsLED Student Quiz
Total questions: 18
Worksheet time: 9mins
LED is short for:
a Light Emitting Diode
a Liquid Energy Device
a Low Energy Detector
a Linear Electrical Display
2. The invention of LED lights is attributed to which individual?
Albert Einstein
Thomas Edison
Nick Holonyak Jr.
Alexander Graham Bell
What year were LEDs invented?
1980
1890
1962
2001
LEDs differ from traditional light bulbs in the following way:
LEDs use more energy than traditional light bulbs.
LEDs produce light by heating a filament.
The light generated by an LED is actually a result of the release of photons from the movement of these electrons
LEDs emit light in all directions like traditional bulbs.
The light generated by an LED is actually a result of the release of _____________ from the movement of these __________.
voltage, electrons
photons, heat
current, photons
photons, electrons
When there are extra holes in the semiconductor, there are extra __________ charged particles.
neutrally
negatively
positively
electrically
LED is short for light emitting diode.
True
False
8. LEDs were invented for which primary reason?
To improve the brightness of outdoor lights
To replace incandescent bulbs with cheaper alternatives
To create decorative lighting for festivals
To provide efficient and long-lasting lighting
The color of the epoxy layer gives the LED its color.
True
False
Define what each element in the LED bulb does: Epoxy lens – ____________________________
Protects the internal components and shapes the light output.
Acts as the power source for the LED bulb.
Controls the color of the emitted light.
Serves as the heat sink for the LED bulb.
Define what each element in the LED bulb does: LED Chip – ____________________________
LED Chip: The wire that supplies electricity to the bulb.
LED Chip: The plastic casing that protects the bulb from damage.
LED Chip: The metal base that connects the bulb to the socket.
LED Chip: The semiconductor device that emits light when current flows through it.
Define what each element in the LED bulb does: Reflective cavity – ____________________________
Reflective cavity: Absorbs light to reduce heat.
Reflective cavity: Reflects light emitted by the LED chip to enhance brightness and direction.
Reflective cavity: Generates electricity for the LED chip.
Reflective cavity: Acts as a heat sink to cool the LED chip.
Define what each element in the LED bulb does: Bond wire – ____________________________
Connects the LED chip to the external leads for electrical contact.
Provides mechanical support to the LED bulb.
Acts as a heat sink for the LED chip.
Serves as the main light-emitting component.
Define what each element in the LED bulb does: Anode – ____________________________
Anode: The positive terminal where current enters the LED.
Anode: The negative terminal where current leaves the LED.
Anode: The part that emits light in the LED.
Anode: The glass enclosure of the LED.
Define what each element in the LED bulb does:
Cathode: The glass enclosure of the LED.
Cathode: The positive terminal where current enters the LED.
Cathode: The part that emits light in the LED.
The negative terminal where current exits the LED.
On a Microbit, there are ______ number of pins for LED programming.
16
12
7
3
The pin LED on the Microbit function only when the LED functions are selected.
True
False
On a Microbit, the ________ setting can range from 0 to 1023 while the __________ setting can only range from 0 to 1.
analog, digital
digital, analog
input, output
high, low
