Description: If the switch S1 is closed electricity takes the path of the least resistance and flows from the positive terminal Vin through the 100 resistor R1 to the Input pin If the switch is open the Input pin is connected to the ground through the two resistors R1 and R2 so no electricity is floating toward the Input pin as it would without the 10k pulldown resistor R2 at least for some time after the switch S1 was opened This is important in digital electronics where an input pin needs to be in just one of two states high or low at any moment in timeThis is a conceptual schematic The switch does not have to be a physical switch such as a button It can be and often is a digital component that can switch between two states and let electricity through in one state while blocking it in the other
By: AdamStanislav
Date: 2017-09-27
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Filesize: 31100
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Pulldown Resistor Circuit Schematic sourced from Openclipart is licensed under CC0 1.0
* Note: Date might not match original source and might be an educated guess.