1. What is Ohm's Law?

Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points, and inversely proportional to the resistance between them. It's a fundamental principle in electrical engineering and physics.

2. How Does the Calculator Work?

The calculator uses the Ohm's Law equation:

Where:

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

Explanation: The equation shows that resistance equals voltage divided by current. Higher voltage with the same current means higher resistance, while higher current with the same voltage means lower resistance.

3. Importance of Resistance Calculation

Details: Calculating resistance is essential for designing electrical circuits, selecting appropriate components, troubleshooting electrical systems, and ensuring safe operation of electrical devices.

4. Using the Calculator

Tips: Enter voltage in volts and current in amperes. Both values must be positive numbers. The calculator will compute the resistance in ohms.

5. Frequently Asked Questions (FAQ)

Q1: What are typical resistance values in circuits?
A: Resistance values vary widely from milliohms in power systems to megaohms in electronic circuits, depending on the application.

Q2: Does Ohm's Law apply to all materials?
A: No, Ohm's Law applies to "ohmic" materials where resistance is constant. Non-ohmic materials (like diodes) don't follow this linear relationship.

Q3: How does temperature affect resistance?
A: In conductors, resistance typically increases with temperature. In semiconductors, resistance usually decreases with temperature.

Q4: What if I have zero current but voltage present?
A: This would theoretically imply infinite resistance (open circuit). In practice, there's always some small leakage current.

Q5: Can I calculate power from these values?
A: Yes, power (P) can be calculated as P = V×I or P = I²×R or P = V²/R once you have any two of the three values.