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Resistor Ratio Formula:
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The resistor ratio is a simple calculation that determines the relationship between two resistance values. It's commonly used in circuit design, voltage divider calculations, and impedance matching applications.
The calculator uses the resistor ratio formula:
Where:
Explanation: The ratio represents how many times larger R1 is compared to R2. A ratio greater than 1 indicates R1 is larger, while a ratio less than 1 indicates R2 is larger.
Details: Calculating resistor ratios is essential for designing voltage dividers, setting gain in amplifier circuits, creating balanced bridge circuits, and ensuring proper impedance matching in electronic systems.
Tips: Enter resistance values for both resistors in ohms. Both values must be positive numbers greater than zero. The calculator will compute the ratio R1/R2.
Q1: What is a typical resistor ratio used in voltage dividers?
A: Common ratios include 1:1, 2:1, and 10:1, depending on the desired output voltage relative to the input voltage.
Q2: Does the ratio change if I use different units (kΩ vs Ω)?
A: No, as long as both resistors are measured in the same units, the ratio remains the same. The units cancel out in the division.
Q3: How precise should my resistor values be for accurate ratio calculation?
A: For most applications, standard resistor tolerances (1%, 5%) are sufficient. For precision circuits, use resistors with tighter tolerances (0.1%, 0.01%).
Q4: Can I calculate the ratio with more than two resistors?
A: This calculator is designed for two resistors. For multiple resistors, you would need to calculate equivalent resistance first before finding ratios.
Q5: Why is resistor ratio important in amplifier circuits?
A: In op-amp circuits, the ratio of feedback resistors determines the gain of the amplifier, making accurate ratio calculation critical for proper circuit operation.