A voltage divider is a simple linear circuit that produces an output voltage that is a fraction of its input voltage. It is commonly used to create a reference voltage.
A voltage divider network consists of two or more resistors connected in a series. Before the advent of AC, the only way to change a DC voltage from one value to another was by the use of a voltage divider network. The circuit diagram below illustrates a simple two resistor voltage divider network.
The two resistors, R1and R2, are the ratio resistors and will determine the value of output voltage across R2. If both resistors are the same value then each will have one half of the supply voltage across them. The output voltage will then be one half of the supply voltage. If R2 was twice the value of R1 then it will have twice the voltage across it or 2/3 of the supply voltage.
To learn more about divider law, download and progress through the workbook provided with this section.
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