Voltage Divider Equation
The formula for calculating the output voltage is based on ohms law and is shown below.
Voltage divider equation. The input voltage v in and both resistor values r 1 and r 2. The voltage divider equation assumes that you know three values of the above circuit. A voltage divider referenced to ground is created by connecting two electrical impedances in series as shown in figure 1. A voltage divider is a fundamental circuit used in the field of electronics.
By using the following equation we can find the output voltage. From the above equation of the voltage divider formula we can confirm that the scaling factor for the output voltage is determined by the ratio r2 r1 r2. V r x is the voltage drop across the resistor r x is the value of the resistor and r t is the total resistance of the series network. If the current in the output wire is zero.
The voltage divider rule equation accepts when you know the three values in the above circuit they are input voltage and the two resistor values. Deriving voltage divider equation. In this article we will discuss voltage divider formula with example. Given those values we can use this equation to find the output voltage v out.
A voltage divider circuit is a very common circuit that takes a higher voltage and converts it to a lower one by using a pair of resistors. With a little bit of algebra we can derive a formula for determining series resistor voltage drop given nothing more than total voltage individual resistance and total resistance. In fact we can derive the voltage divider equation simply by using the ohm s law. It can produce a portion of its input voltage as an output.
The basis for the voltage divider circuit is the ohm s law. It is generally formed using two resistors and a voltage source.