1. What is Ohm's Law for Resistance?

Ohm's Law for resistance states that the electrical resistance (R) in a circuit is equal to the voltage (V) across the circuit divided by the current (I) flowing through it. This fundamental principle in electrical engineering helps determine how much a material opposes the flow of electric current.

2. How Does the Calculator Work?

The calculator uses Ohm's Law equation:

Where:

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

Explanation: The equation shows the direct relationship between voltage and resistance, and the inverse relationship between current and resistance.

3. Importance of Resistance Calculation

Details: Calculating resistance is essential for designing electrical circuits, selecting appropriate components, ensuring safety, and troubleshooting electrical systems. It helps prevent circuit overloads and equipment 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. The calculator will compute the resistance in ohms (Ω).

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: Can resistance be negative?
A: No, resistance cannot be negative as it represents opposition to current flow. Negative values would be physically impossible.

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 with temperature.

Q5: What is the difference between resistance and resistivity?
A: Resistance is a property of a specific object, while resistivity is an intrinsic property of a material regardless of its size or shape.