1. What is Resistance?

Resistance is a measure of the opposition to current flow in an electrical circuit. It is measured in ohms (Ω) and is a fundamental concept in electrical engineering and physics.

2. How Does the Calculator Work?

The calculator uses Ohm's Law:

Where:

• \( R \) — Resistance (Ω)
• \( V \) — Voltage (V)
• \( I \) — Current (A)

Explanation: The resistance is calculated by dividing the voltage by the current in the circuit.

3. Importance of Resistance Calculation

Details: Calculating resistance is essential for designing electrical circuits, selecting appropriate components, and troubleshooting electrical systems.

4. Using the Calculator

Tips: Enter voltage in volts (V) and current in amperes (A). Both values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is the unit of resistance?
A: The unit of resistance is the ohm, represented by the Greek letter omega (Ω).

Q2: What are typical resistance values?
A: Resistance values can range from milliohms (mΩ) in conductors to megaohms (MΩ) in insulators.

Q3: Does resistance change with temperature?
A: Yes, for most materials, resistance increases with temperature (positive temperature coefficient).

Q4: What's the difference between resistance and impedance?
A: Resistance is for DC circuits, while impedance (which includes resistance and reactance) is for AC circuits.

Q5: Can resistance be negative?
A: In some special cases (like certain semiconductor devices), negative differential resistance can occur, but ordinary resistance is always positive.