Voltage Divider Calculator
Calculate output voltage or unknown resistor values in a voltage divider circuit.
Voltage Divider Calculation
Understanding Voltage Dividers
A voltage divider is a simple passive linear circuit that produces an output voltage (Vout) that is a fraction of its input voltage (Vin). It consists of two series resistors (R1 and R2) connected across a voltage source.
Voltage Divider Formula
Vout = Vin × (R2 / (R1 + R2))
Key Concepts
- Input Voltage (Vin): The total voltage supplied to the divider.
- Output Voltage (Vout): The desired fraction of the input voltage.
- Resistors (R1, R2): The two resistors that form the divider.
Applications of Voltage Dividers
| Application | Description |
|---|---|
| Sensor Interfacing | Scaling down sensor output voltage to match microcontroller ADC input range. |
| Level Shifting | Converting a higher voltage signal to a lower voltage signal. |
| Potentiometers | Variable resistors used as adjustable voltage dividers. |
| Battery Voltage Monitoring | Reducing battery voltage to a measurable level for microcontrollers. |
Frequently Asked Questions
Can a voltage divider be used to power a load?
While a voltage divider can provide a specific voltage, it is generally not efficient for powering loads that draw significant current, as much of the power is dissipated as heat in the resistors. For powering loads, voltage regulators are preferred.
What happens if R2 is very small or very large?
If R2 is very small compared to R1, Vout will be close to 0V. If R2 is very large compared to R1, Vout will be close to Vin.