Resistor Divider Calculator Standard Values

Resistor Divider Formula:

\[ V_{out} = V_{in} \times \frac{R2}{R1 + R2} \]

Input Voltage (V_in):

Desired Output Voltage (V_out):

E-Series:

Recommended Resistors:

Actual Output Voltage:

Error:

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1. What is a Resistor Divider?

A resistor divider is a simple circuit that produces an output voltage (V_out) that is a fraction of the input voltage (V_in). It consists of two resistors connected in series, with the output voltage taken from the connection point between them.

2. How Does the Calculator Work?

The calculator uses the resistor divider formula:

\[ V_{out} = V_{in} \times \frac{R2}{R1 + R2} \]

Where:

\( V_{in} \) — Input voltage
\( V_{out} \) — Output voltage
\( R1 \) — First resistor value
\( R2 \) — Second resistor value

Explanation: The calculator finds the best combination of standard resistor values from the selected E-series that produces an output voltage closest to your desired value.

3. Importance of Standard Resistor Values

Details: Electronic components are manufactured in standard values to ensure availability and cost-effectiveness. The E-series (E12, E24, E96) represents different tolerance levels and value ranges.

4. Using the Calculator

Tips: Enter your input voltage and desired output voltage, then select the E-series you want to use. The calculator will find the best resistor combination from standard values.

5. Frequently Asked Questions (FAQ)

Q1: What are E-series resistor values?
A: E-series are standardized sets of resistor values that follow a logarithmic scale. E12 has 12 values per decade with 10% tolerance, E24 has 24 values with 5% tolerance, and E96 has 96 values with 1% tolerance.

Q2: Why can't I use any resistor value?
A: While custom values could be created, standard values are mass-produced, readily available, and cost-effective for most applications.

Q3: What if I need more precision?
A: For higher precision, you can use resistor networks, trimmer potentiometers, or combine multiple standard resistors in series or parallel.

Q4: How does resistor tolerance affect the output?
A: Resistor tolerance adds uncertainty to the output voltage. A 1% tolerance resistor will produce a more accurate output than a 10% tolerance resistor.

Q5: Can I use this for AC signals?
A: Yes, but at high frequencies, you need to consider the frequency response and parasitic capacitance of the resistors.