[SLOT_01]|SYSTEM_TAG: VOLT_DIV
Voltage Divider
Ready for computation
[ FUNCTION MODE ]
[ PARAMETERS ]
[ SOLVED READOUT ]
VOUT = 2.5000V
Formula: Vout = Vin × (R2 / (R1 + R2))
[ LIVE SCHEMATIC ]
[ THE THEORY ]
A voltage divider is a simple passive linear circuit that scales down an input voltage. The output voltage is directly proportional to R2's fraction of the total series resistance (R1 + R2).
[ KEY USES ]
- Level-shifting communication lines (e.g., 5V to 3.3V UART).
- ADC scaling to monitor battery voltages safely.
- Interfacing analog resistive sensors (like LDRs/Thermistors).
[ DETAILED THEORY & SPECIFICATIONS ]▼
What is a Voltage Divider?
A voltage divider is a simple and widely used electronic circuit that reduces a higher input voltage to a lower output voltage using two resistors connected in series.
It is commonly used in:
- Signal level reduction
- ADC input scaling (microcontrollers)
- Sensor interfacing
- Reference voltage generation
How It Works:
- In a voltage divider, the same current flows through both resistors because they are in series.
- The voltage drop across each resistor depends on its resistance value.
- Higher resistance > higher voltage drop
- Lower resistance > lower voltage drop
- By choosing proper resistor values, we can get the desired output voltage.
Formula Variables:
| Symbol | Description |
|---|---|
| Vin | Input Voltage (V) |
| Vout | Output Voltage (V) |
| R1, R2 | Resistor values (Ω) |
Key Features:
Calculate Vout from Vin, R1, R2 | Calculate Vin from Vout, R1, R2 | Calculate R1 from Vin, Vout, R2 | Calculate R2 from Vin, Vout, R1 | Real-time calculation
Specifications:
| Formula | Vout = Vin × (R2 / (R1 + R2)) |
| Inputs | Vin, R1, R2, Vout |
| Output | Unknown value |
| Precision | Up to 6 decimal places |
| Units | Volts, Ohms |