Simple LED circuit

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The following circuit is the most simple LED circuit possible. The same circuit is displayed in three ways:

  • a breadboard diagram
  • a photo of a real circuit
  • an electronics schematic diagram

The Most Simple LED Circuit


  1. What is the purpose of the resistor?
  2. Using Ohm's Law (V=IR), what is the current running through this circuit?
  3. Using Ohm's Law again, calculate the resistor value you would have to use in order to have only 15mA of current in this circuit?
  4. Assuming the LED drops 2.2V of voltage, how much voltage is dropped by the resistor?

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