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 and inversely proportional to the resistance between them.

2. How Does the Calculator Work?

The calculator uses Ohm's Law equation:

Rearranged to solve for resistance:

Where:

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

Explanation: The equation calculates the electrical resistance when voltage and current values are known.

3. Importance of Resistance Calculation

Details: Calculating resistance is crucial for circuit design, troubleshooting electrical systems, selecting appropriate components, and ensuring electrical safety in various applications.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is the unit of resistance?
A: Resistance is measured in ohms (Ω), named after German physicist Georg Ohm.

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

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

Q4: Does temperature affect resistance?
A: Yes, for most materials, resistance increases with temperature. This calculator assumes constant temperature conditions.

Q5: What if I get zero or infinite resistance?
A: Zero resistance indicates a short circuit, while infinite resistance indicates an open circuit. Both are theoretical extremes not achievable in practical circuits.