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.

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 resistance is calculated by dividing the voltage by the current flowing through the conductor.

3. Importance of Resistance Calculation

Details: Calculating resistance is fundamental in electrical engineering and electronics for circuit design, troubleshooting, and ensuring proper operation of electrical components.

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 if I know resistance and want to find voltage or current?
A: The equation can be rearranged: \( V = I \times R \) for voltage or \( I = V / R \) for current.

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 diodes are non-ohmic.

Q3: What are typical resistance values in circuits?
A: Resistors range from milliohms (mΩ) to megaohms (MΩ), depending on application.

Q4: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. Some materials like semiconductors show opposite behavior.

Q5: What's the difference between resistance and impedance?
A: Resistance applies to DC circuits, while impedance (which includes resistance and reactance) applies to AC circuits.