1. What is Ohm's Law Resistance?

Ohm's Law describes the relationship between voltage, current, and resistance in an electrical circuit. The resistance (R) is calculated as the ratio of voltage (V) to current (I).

2. How Does the Calculator Work?

The calculator uses the Ohm's Law formula:

Where:

• \( R \) — Resistance in ohms (Ω)
• \( V \) — Voltage in volts (V)
• \( I \) — Current in amperes (A)

Explanation: The formula shows that resistance is directly proportional to voltage and inversely proportional to current in a circuit.

3. Importance of Resistance Calculation

Details: Calculating resistance is fundamental in electrical engineering and electronics for circuit design, troubleshooting, and component selection.

4. Using the Calculator

Tips: Enter voltage in volts and current in amps. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What are the units of measurement?
A: Resistance is measured in ohms (Ω), voltage in volts (V), and current in amperes (A).

Q2: Can this calculator be used for AC circuits?
A: This calculator uses the basic DC version of Ohm's Law. For AC circuits with reactive components, impedance calculations are needed.

Q3: What is a typical resistance range?
A: Resistance values can range from milliohms (mΩ) in conductors to megaohms (MΩ) in insulators, depending on the material and application.

Q4: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. The relationship is described by the temperature coefficient of resistance.

Q5: What are some common applications?
A: Resistance calculations are used in circuit design, electrical safety analysis, component selection, and troubleshooting electrical systems.