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 formula:

Where:

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

Explanation: The resistance is calculated 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 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: The unit of resistance is the ohm (Ω), named after Georg Simon Ohm who formulated Ohm's Law.

Q2: Can resistance be negative?
A: In conventional materials, resistance is always positive. Negative resistance can occur in some semiconductor devices under specific conditions.

Q3: What factors affect resistance?
A: Resistance depends on the material's resistivity, length, cross-sectional area, and temperature.

Q4: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. For semiconductors, resistance typically decreases with temperature.

Q5: What are typical resistance values?
A: Resistance values range from milliohms (conductors) to megaohms (insulators), depending on the material and application.