1. What Is Resistance And Its Formula?

Resistance is a fundamental property in electrical circuits that opposes the flow of electric current. It is measured in ohms (Ω) and is defined by Ohm's Law, which 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, ensuring safety, and troubleshooting electrical systems. It helps prevent circuit overloads and component damage.

4. Using The Calculator

Tips: Enter voltage in volts (V) and current in amperes (A). 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 German physicist Georg Simon Ohm.

Q2: 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.

Q3: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. For semiconductors, resistance typically decreases with temperature.

Q4: What factors determine a material's resistance?
A: Resistance depends on the material's resistivity, length, cross-sectional area, and temperature.

Q5: Can resistance be negative?
A: In ordinary materials, resistance is always positive. Negative resistance can occur in certain semiconductor devices under specific conditions.