1. What is Ohm's Law?

Ohm's Law is a fundamental principle in electrical engineering and physics 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 formula:

Where:

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

Explanation: The formula calculates 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 safety in electrical systems.

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: When is Ohm's Law applicable?
A: Ohm's Law applies to linear electrical circuits where the resistance remains constant regardless of the voltage or current.

Q3: What are typical resistance values?
A: Resistance values vary widely - from fractions of an ohm for conductors to millions of ohms for insulators.

Q4: Can resistance be negative?
A: In conventional materials, resistance is always positive. Negative resistance occurs only in special semiconductor devices under specific conditions.

Q5: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature, while for semiconductors, resistance typically decreases with temperature.