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What is the role of a resistor when connecting a single LED to a Raspberry Pi GPIO pin?

easy📝 Conceptual Q1 of 15
Raspberry Pi - LED and Button Projects
What is the role of a resistor when connecting a single LED to a Raspberry Pi GPIO pin?
AIt limits the current to prevent damaging the LED or GPIO pin
BIt increases the voltage to make the LED brighter
CIt stores electrical energy for the LED
DIt changes the LED color
Step-by-Step Solution
Solution:

  1. Step 1: Understand the electrical needs of an LED

    An LED requires a limited current to operate safely without damage.

  2. Step 2: Role of resistor in circuit

    A resistor controls the current flow, protecting both the LED and the Raspberry Pi GPIO pin from excess current.

  3. Final Answer:

    It limits the current to prevent damaging the LED or GPIO pin -> Option A

  4. Quick Check:

    Resistor function = Limit current [OK]
Quick Trick: Always use a resistor to protect your LED and GPIO pin [OK]
Common Mistakes:
  • Thinking resistor increases voltage
  • Skipping resistor and damaging components
  • Confusing resistor with capacitor

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