LED, Resistor, and Switch in Series: A Quick Guide

To try making a simple electronic circuit, you can connect an LED, a resistor, and a switch in a series. This setup is easy to assemble and teaches you how electrical components work together as a system. First and foremost, I want to highlight the LED which is an acronym for Light Emitting Diode. The LEDs are unique due to the fact that they only glow when an electric current passes through them, but the current must be in a certain direction — that is, from the positive end to the negative end. 

A resistor reduces the amount of power flow, protecting the LED from receiving too much power. You determine the required resistance based on the battery’s power and the LED’s needs. Using this simple equation, you find that a 470ohm resistor will keep the LED safe and bright.

Last but not least, there is the switch that allows you to turn electricity on and off. When the switch is in the “on” position, it completes the circuit, the electricity flows from the battery, through the resistor, through the LED (lights it up), and back to the battery. When you flip the switch, it cuts the circuit, and electricity stops flowing to the LED bulb. This concept does not only demonstrate the way switches operate but also allows you to operate the circuit at your convenience.



Soldering with lead-based solder gets easier with practice. Remember, safety first because lead is toxic. Always wash your hands after using lead-based solder and think about using lead-free solder if it works for your project.

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