1. What is Ohm's Law?

Ohm's Law is a fundamental principle in electrical engineering that defines the relationship between voltage, current, and resistance in an electrical circuit. It 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 Ohm's Law equation:

Where:

• \( R \) — Resistance (Ohms, Ω)
• \( V \) — Voltage (Volts, V)
• \( I \) — Current (Amperes, A)

Explanation: The equation shows that resistance equals voltage divided by current. This relationship is linear for ohmic conductors at constant temperature.

3. Importance of Resistance Calculation

Details: Calculating resistance is essential for circuit design, troubleshooting electrical systems, selecting appropriate components, and ensuring electrical safety in various applications.

4. Using the Calculator

Tips: Enter voltage in volts (V) and current in amperes (A). Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What are the units of measurement for resistance?
A: Resistance is measured in Ohms (Ω). Common multiples include kiloohms (kΩ) and megaohms (MΩ).

Q2: Does Ohm's Law apply to all materials?
A: Ohm's Law applies to ohmic materials (like most metals) but not to non-ohmic materials (like diodes and transistors) which have non-linear current-voltage relationships.

Q3: What factors affect resistance?
A: Resistance depends on the material's resistivity, length, cross-sectional area, and temperature.

Q4: How is resistance measured experimentally?
A: Resistance can be measured using a multimeter, Wheatstone bridge, or by applying known voltage and measuring current.

Q5: What's the difference between AC and DC resistance?
A: For pure resistors, AC and DC resistance are the same. However, for components like inductors and capacitors, impedance (AC resistance) differs from DC resistance.