1. What is a Value of Resistor Calculator?

Definition: This calculator determines the resistance value (in ohms) based on the voltage across and current through a resistor using Ohm's Law.

Purpose: It helps electronics engineers, technicians, and hobbyists quickly calculate the required resistance for circuits.

2. How Does the Calculator Work?

The calculator uses Ohm's Law formula:

Where:

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

Explanation: The voltage is divided by the current to determine the resistance value needed in a circuit.

3. Importance of Resistance Calculation

Details: Proper resistance calculation ensures correct current flow, prevents component damage, and helps design efficient circuits.

4. Using the Calculator

Tips: Enter the voltage across the resistor (in volts) and the desired current (in amps). Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is Ohm's Law?
A: Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

Q2: Can I use this for AC circuits?
A: This calculator is for DC circuits. For AC, you need to consider impedance which includes resistance and reactance.

Q3: What if I get zero resistance?
A: Zero resistance suggests a short circuit. Check your input values as resistance should always be positive.

Q4: How precise should my measurements be?
A: For most applications, 2-3 decimal places are sufficient, but precision circuits may require more accurate measurements.

Q5: What about resistor power rating?
A: This calculator gives resistance value only. Power (P=V×I) should be calculated separately to select appropriately rated resistors.