1. What is Ohm's Law?

Ohm's Law is a fundamental principle in electrical engineering that describes 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.

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

3. Importance of Resistance Calculation

Details: Calculating resistance is crucial for circuit design, component selection, troubleshooting electrical systems, and ensuring proper operation of electronic devices.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What are the units for resistance?
A: Resistance is measured in ohms (Ω). Common multiples include kilo-ohms (kΩ) and mega-ohms (MΩ).

Q2: Can I use this calculator for AC circuits?
A: This calculator uses the basic Ohm's Law for DC circuits. For AC circuits, impedance calculations are more complex and involve reactance.

Q3: What is a typical resistance range?
A: Resistance values can range from milliohms (mΩ) for conductors to gigaohms (GΩ) for insulators, depending on the material and application.

Q4: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. The temperature coefficient varies by material.

Q5: What are common resistor values?
A: Resistors follow standard E-series values (E6, E12, E24, etc.) with specific tolerance ratings for manufacturing consistency.