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 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 problems, and ensuring safe operation of electrical devices.

4. Using the Calculator

Tips: Enter voltage in volts and current in amps. 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 sensitive electronics, 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. Some materials like semiconductors are non-ohmic.

Q3: What if I get zero resistance?
A: Zero resistance would indicate a superconductor or a short circuit. In practice, all real conductors have some resistance.

Q4: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. For semiconductors, resistance typically decreases with temperature.

Q5: Can I calculate resistance for AC circuits?
A: For AC circuits, you need to consider impedance which includes resistance, capacitive reactance and inductive reactance.