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Calculate voltage divider output voltage

Inhaltsverzeichnis

Wie zu Verwenden

Enter the input voltage (Vin)
Enter resistor 1 value (R1) - the resistor between input and output
Enter resistor 2 value (R2) - the resistor between output and ground
Click calculate to see output voltage and circuit current

Voltage Divider Basics

A voltage divider is a simple circuit that produces an output voltage that is a fraction of its input voltage. It consists of two resistors in series connected between an input voltage source and ground.

Voltage dividers are used to create reference voltages, reduce signal levels for measurement, and bias transistors.

Voltage Divider Formula

Vout = Vin × (R2 / (R1 + R2))
Where Vout = output voltage
Vin = input voltage
R1 = resistor between input and output
R2 = resistor between output and ground

Applications

Creating reference voltages
Signal attenuation
Sensor interfacing
Biasing circuits
Level shifting
Potentiometers and variable resistors

Häufig gestellte Fragen

What is a voltage divider used for?: Voltage dividers create a lower voltage from a higher voltage source. Common uses include creating reference voltages, reducing signal levels for analog-to-digital converters, and biasing transistors.
Does a voltage divider waste power?: Yes, voltage dividers continuously draw current and dissipate power as heat. For this reason, they're not efficient for powering loads. Use voltage regulators for better efficiency.
What happens if I connect a load?: Connecting a load in parallel with R2 changes the output voltage. The load resistance combines with R2, reducing the effective R2 value and lowering the output voltage. For accurate voltage division, the load resistance should be much higher than R2.