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WorksheetsLed
Total questions: 15
Worksheet time: 15mins
A resistor is connected with the LED to
protect the LED
give power to the LED
The resistor connected to a LED has typical resistance values between:
10K - 20K
200R - 1K
2K - 8K
10R -100R
Which diodes are directly polarized
D1
D2
Both
None
Which diodes are directly polarized
D1
D2
Both
None
What is the primary function of a LED in electronic circuits?
To emit light
To store energy
To amplify signals
To convert AC to DC
Which material is commonly used as the semiconductor in LEDs?
Silicon
Gallium arsenide
Copper
Iron
What does LED stand for?
Light Emitting Diode
Light Energy Device
Low Energy Diode
Light Emission Device
In a LED, what determines the color of the emitted light?
The voltage applied
The type of semiconductor material
The current passing through
The size of the LED
Which of the following is a common application of LEDs?
Data storage
Lighting and displays
Magnetic resonance imaging
Chemical synthesis
What is the typical forward voltage range for a standard red LED?
1.8V to 2.2V
3.0V to 3.6V
0.5V to 1.0V
4.5V to 5.0V
How does increasing the current through a LED affect its brightness?
Increases brightness
Decreases brightness
No effect
Changes color
What is the role of a resistor in series with a LED?
To limit the current
To increase the voltage
To change the color
To store charge
Which of the following is a benefit of using LEDs over incandescent bulbs?
Higher energy consumption
Shorter lifespan
Lower heat emission
Less efficient
What happens if a LED is connected in reverse bias?
It emits light
It gets damaged
It stores energy
It amplifies signals
In terms of energy efficiency, how do LEDs compare to traditional lighting?
More efficient
Less efficient
Same efficiency
Not applicable
