Create a Basic Circuit: LED and Battery Setup Guide

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SUMMARY

This discussion focuses on creating a basic circuit where an LED lights up when a wire is unplugged from the circuit. The proposed solution involves using a resistor in front of the LED to prevent battery drainage while ensuring that the LED remains off during normal operation. The schematic provided illustrates the circuit design, emphasizing the importance of the path of least resistance in controlling the LED's state. The goal is to achieve this functionality without compromising battery life.

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  • Basic understanding of electrical circuits
  • Knowledge of LED functionality and characteristics
  • Familiarity with resistors and their role in circuits
  • Ability to read and interpret circuit schematics
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Electronics enthusiasts, hobbyists building simple circuits, and anyone interested in LED applications and battery management in circuit design.

Inspiron1
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Hello all. I am trying to build a very simple circuit and need some help.

I want to have an LED connected to a battery, and if a wire is unplugged from the circuit then the LED lights up.

Does anyone know how I can make this happen?
 
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Here is a picture of a schematic that gets the job done, but it drains the battery.

Ok, see the middle wire? While that middle wire is connected the led will not light up because the current will take the path of least resistance. So I would probably put a resistor in front of the LED.

But if you remove the wire the LED lights up.

So the LED should typically not be lit, but if I unplug a wire then the LED lights up.

That's all I need! But without draining the battery of course!
 

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