1. What is Electrical Resistance?

Electrical resistance is a measure of the opposition to the flow of electric current in a circuit. It is measured in ohms (Ω) and is a fundamental property in electrical engineering and physics.

2. How Does the Calculator Work?

The calculator uses Ohm's Law:

Where:

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

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

3. Importance of Resistance Calculation

Details: Accurate resistance calculation is crucial for circuit design, troubleshooting electrical systems, and ensuring proper functioning of electronic devices.

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 electrical resistance?
A: The unit of electrical resistance is the ohm, symbolized by Ω.

Q2: Can resistance be negative?
A: No, resistance is always a positive value as it represents opposition to current flow.

Q3: What factors affect electrical 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, while for semiconductors, resistance typically decreases.

Q5: What is the difference between AC and DC resistance?
A: DC resistance is constant, while AC resistance (impedance) varies with frequency due to inductive and capacitive effects.