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 formula:

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 is the unit of resistance?
A: Resistance is measured in ohms (Ω), named after German physicist Georg Simon Ohm.

Q2: Can Ohm's Law be used for AC circuits?
A: Ohm's Law applies to both DC and AC circuits, but for AC circuits with reactive components, impedance should be considered instead of pure resistance.

Q3: What are typical resistance values in circuits?
A: Resistance values range from milliohms (mΩ) in conductors to megaohms (MΩ) in insulators, with common resistor values from 1Ω to 10MΩ.

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

Q5: What is the difference between resistance and impedance?
A: Resistance is the opposition to DC current, while impedance is the total opposition to AC current, including both resistance and reactance.