The Resistor divider or voltage divider calculation calculates the output voltage in the voltage divider circuit. Enter the required resistor values and input volt to get accurate output voltage through the resistor divider circuit. The online voltage divider calculator is given below.
Enter any three of the following values and then click calculate button.
V _{in} = Input Voltage |
Also Check : Parallel resistor calculator
The voltage divider
The voltage divider is a two resistor combination circuit. The two resistors are connected in series and taking the voltage out from the common shorted end of both resistors. The voltage divider turns large voltage into smaller one. If you want to measure the output voltage of a voltage divider use the above voltage divider calculator tool.
Voltage divider circuit
The circuit of the voltage divider consist of two resistors and an input voltage source. Both resistors are connected in series and a common out put is takes out from the both resistor connected end. The ground is common in here. The main feature of using voltage divider is to get small voltage at the output section. From the circuit diagram the voltage is applied voltage source across the series connection of resistor.
The Formula
The formula of the voltage divider circuit is obtained from the above circuit diagram. The input voltage is denoted as Vin, The Resistor connected to the positive potential is Ra, The resistor connected with the ground is denoted as Rb respectively. So the equation to find Vout (voltage output of resistor divider ) is
V_{out} = V _{in} * R_{2}/ R_{1} + R_{2}
From the above equation it states that the output voltage of resistor divider is directly proportional to the input voltage connecting to the resistor and the ratio of Ra and Rb. The complete derivation is given at the end of this post.
Application
The voltage divider has many applications in electronics engineering and circuit development. A few number of applications are discussing here.
1. Variable resistors
The variable resistor is used to adjust the potential difference in a circuit. The variable resistors are also known as potentiometer. The potentiometer has three terminals the two parallel legs of variable resistor is common resistance track. The third pin is sliding over the tracks to adjust the resistance value.
2. LDR ( Light dependent resistor ) Circuit
Also Check : Resistance vs impedance
The light dependent resistors are also known as photo resistors. The internal resistance of the electronic component will changes when any light falling on it. So this is a self resistance adjustable resistor, if you are connecting a resistor with LDR in series the common end of LDR and resistor connection is Taking out, This is act as a voltage divider in the circuit.
3. Rheostat
The rheostat is also have much similarity with the potentiometer. But they are not using as a potential divider because it have a two terminals. One end of rheostat is connected with a wiper, it will wiped over it. In older electronics the rheostat is used as a controller to control high voltage. Like bulb load, Motor etc.The rheostat is constructed with copper wires wounded in toroidal cores and it creates the resistance.
4. Voltmeter circuit
Most of the arduino and inverter circuit have the voltage divider on it. The voltage divider is provide less voltage than the input. So the this decreased voltage can able to measure within the range of arduino input. The specific code is applied for voltage divider in arduino projects.
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