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 law forms the basis for understanding electrical circuits and their behavior.

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: Accurate resistance calculation is crucial for designing electrical circuits, selecting appropriate components, ensuring safety, and troubleshooting electrical systems.

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 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 application.

Q3: When does Ohm's Law apply?
A: Ohm's Law applies to ohmic conductors where resistance remains constant regardless of voltage or current changes.

Q4: What factors affect resistance?
A: Resistance depends on material, length, cross-sectional area, and temperature of the conductor.

Q5: Can resistance be negative?
A: In conventional materials, resistance is always positive. Negative resistance occurs only in certain semiconductor devices under specific conditions.