1. What is a 3 Resistor Voltage Divider?

Definition: A voltage divider circuit that uses three resistors to produce an output voltage (V_out) that is a fraction of the input voltage (V_in).

Purpose: Used in electronics to create reference voltages, reduce signal levels, or interface between different voltage circuits.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( V_{out} \) — Output voltage (volts)
• \( V_{in} \) — Input voltage (volts)
• \( R1, R2, R3 \) — Resistor values (ohms)

Explanation: The output voltage is determined by the ratio of R3 to the total resistance in the divider network.

3. Importance of Voltage Divider Calculation

Details: Accurate voltage division is crucial for proper circuit operation, preventing damage to components, and ensuring signal integrity.

4. Using the Calculator

Tips: Enter the input voltage and all three resistor values. R1 and R2 can be zero, but R3 must be greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: Why use 3 resistors instead of 2?
A: Three resistors provide more flexibility in setting the output voltage and allow for intermediate voltage taps.

Q2: What happens if R1 or R2 is zero?
A: If R1=0, it becomes a 2-resistor divider between R2 and R3. If R2=0, it becomes a divider between R1 and R3.

Q3: How does resistor tolerance affect accuracy?
A: Resistor tolerances (typically 1-5%) will affect the actual output voltage proportionally.

Q4: Should I consider current draw in this calculation?
A: This calculator assumes negligible load current. For significant loads, use our Loaded Voltage Divider Calculator.

Q5: What's the maximum current through the resistors?
A: Current = V_in/(R1+R2+R3). Ensure resistors can handle this power (P=I²R).