1. What is Ohm's Law?

Ohm's Law is a fundamental principle in electrical engineering that describes the relationship between voltage, current, and resistance in an electrical circuit. It states that the current through a conductor between two points is directly proportional to the voltage across the two points.

2. How Does the Calculator Work?

The calculator uses Ohm's Law equation:

Where:

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

Explanation: The equation calculates the electrical resistance by dividing the voltage by the current flowing through the circuit.

3. Importance of Resistance Calculation

Details: Calculating resistance is crucial for designing electrical circuits, selecting appropriate components, troubleshooting electrical problems, and ensuring circuit safety and efficiency.

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 for resistance?
A: Resistance is measured in ohms (Ω), which represents the opposition to current flow in an electrical circuit.

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

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 the other forms of Ohm's Law?
A: Ohm's Law can be rearranged to solve for any variable: \( V = I \times R \) for voltage, and \( I = \frac{V}{R} \) for current.