1. What is a Voltage Across Resistor Calculator?

Definition: This calculator determines the voltage across a resistor using Ohm's Law based on current and resistance values.

Purpose: It helps electrical engineers, technicians, and students quickly calculate voltage drops across resistors in circuits.

2. How Does the Calculator Work?

The calculator uses Ohm's Law formula:

Where:

• \( V \) — Voltage across resistor (volts)
• \( I \) — Current flowing through resistor (amps)
• \( R \) — Resistance of the component (ohms)

Explanation: The voltage across a resistor is directly proportional to both the current flowing through it and its resistance.

3. Importance of Voltage Calculation

Details: Accurate voltage calculations are essential for circuit design, troubleshooting, and ensuring components operate within their specified ranges.

4. Using the Calculator

Tips: Enter the current in amps and resistance in ohms. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What if I know voltage and want to find current?
A: Use the rearranged formula: \( I = \frac{V}{R} \)

Q2: Does this work for AC circuits?
A: Yes, for purely resistive loads in AC circuits. For reactive components, impedance must be considered.

Q3: What's a typical resistor value range?
A: Resistors commonly range from a few ohms to several megaohms, depending on application.

Q4: How accurate is this calculation?
A: It's theoretically exact for ideal resistors. Real-world factors like temperature may cause minor variations.

Q5: Can I calculate power with this?
A: Not directly, but power can be calculated as \( P = V \times I \) using the results.