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. This relationship is linear for ohmic materials at constant temperature.

3. Importance of Ohm's Law

Details: Ohm's Law is essential for designing electrical circuits, calculating power consumption, selecting appropriate components, and troubleshooting electrical systems.

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 conductors to megaohms in insulators, depending on the material and application.

Q2: Does Ohm's Law apply to all materials?
A: No, it only applies to ohmic materials (like most metals) that maintain constant resistance regardless of voltage or current.

Q3: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. Semiconductors may show the opposite behavior.

Q4: What's the difference between AC and DC resistance?
A: For pure resistors, they're the same. For components like inductors or capacitors, AC resistance (impedance) varies with frequency.

Q5: How can I measure resistance directly?
A: Use a multimeter in resistance mode, ensuring the circuit is powered off and capacitors are discharged.