1. What is a Voltage from Resistance Calculator?

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

Purpose: It helps electrical engineers, technicians, and students quickly calculate voltage in DC circuits or AC circuits with resistive loads.

2. How Does the Calculator Work?

The calculator uses Ohm's Law formula:

Where:

• \( V \) — Voltage (volts)
• \( I \) — Current (amps)
• \( R \) — Resistance (ohms)

Explanation: The voltage across a resistor equals the product of the current flowing through it and its resistance.

3. Importance of Voltage Calculation

Details: Accurate voltage calculation is essential for circuit design, troubleshooting, and ensuring components operate within their specified ratings.

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: Does this work for AC circuits?
A: Yes, for purely resistive loads in AC circuits. For reactive loads, you need to consider impedance.

Q2: What if I know voltage and want to find current?
A: Use \( I = V/R \). We have a separate Current Calculator for this purpose.

Q3: What's a typical resistance value?
A: Resistors range from milliohms to megaohms depending on application. Common values are between 100Ω and 100kΩ.

Q4: How accurate is this calculation?
A: The calculation is mathematically precise, but real-world factors like temperature and component tolerances may affect actual results.

Q5: Can I calculate power from this?
A: Yes, power \( P = V \times I \). Once you have voltage, multiply by current to get power in watts.