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Questions and Answers
What is the result of connecting an LED upside down to a power supply voltage?
What is the result of connecting an LED upside down to a power supply voltage?
- It will emit light temporarily.
- It will not emit light again. (correct)
- It will burn out completely.
- It will emit light permanently.
What happens if you exceed the maximum current for an LED?
What happens if you exceed the maximum current for an LED?
- The LED will emit more intense light but not for long. (correct)
- The LED will become dim immediately.
- The LED will continue to work indefinitely.
- The LED will emit more intense light for a prolonged period.
What component is necessary to prevent an LED from burning out?
What component is necessary to prevent an LED from burning out?
- An additional LED.
- A current limiting resistor. (correct)
- A capacitor.
- A diode.
How many segments does a standard 7-segment display contain?
How many segments does a standard 7-segment display contain?
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In which configuration are the seven segments of a 7-segment display arranged?
In which configuration are the seven segments of a 7-segment display arranged?
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Study Notes
LED Functionality
- LEDs have two terminals: anode (positive) and cathode (negative).
- Proper connection to a power supply allows the LED to emit light.
- Reversing the connection can permanently destroy the LED, preventing it from emitting light again.
LED Current Management
- Each LED has a nominal maximum current specification that should not be exceeded.
- Overdriving an LED causes temporary intense light output but reduces its lifespan significantly.
- To prevent damage from excess current, a current limiting resistor must be used.
Resistor Calculation
- Knowing how to calculate the appropriate resistor value is crucial for LED longevity and proper operation.
LED Displays
- LED displays consist of multiple LEDs housed in a plastic case, often used for visual representations of data.
- The 7-segment display is a popular type, made up of 8 LEDs arranged to form numbers or symbols.
- The configuration includes 7 segments for displaying digits and an additional segment for decimal point indication.
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