1. What is Electrical Resistance?

Electrical resistance is a measure of the opposition to current flow in an electrical circuit. It's measured in ohms (Ω) and calculated using Ohm's Law, which relates voltage, current, and resistance in a circuit.

2. How Does the Calculator Work?

The calculator uses Ohm's Law:

Where:

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

Explanation: The resistance of a circuit is equal to the voltage across it divided by the current flowing through it.

3. Importance of Resistance Calculation

Details: Calculating resistance is fundamental in circuit design, troubleshooting electrical systems, and ensuring proper component selection for electronic devices.

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

Q2: Does resistance depend on voltage or current?
A: Resistance is a property of the material and doesn't depend on voltage or current, though it may change with temperature.

Q3: What's the difference between resistance and resistivity?
A: Resistance is a property of a specific object, while resistivity is a material property independent of size or shape.

Q4: Can resistance be negative?
A: In ordinary materials, resistance is always positive. Negative resistance is a special phenomenon in certain semiconductor devices.

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