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 the Ohm's Law equation:

Where:

• \( R \) — Resistance in ohms (Ω)
• \( V \) — Voltage in volts (V)
• \( I \) — Current in amperes (A)

Explanation: This equation allows you to calculate the resistance when you know the voltage across a component and the current flowing through it.

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 (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 other forms of Ohm's Law?
A: Ohm's Law can be rearranged to solve for any variable: V = I × R for voltage, and I = V / R for current.

Q2: When is Ohm's Law applicable?
A: Ohm's Law applies to resistive circuits and components that follow linear voltage-current relationships, typically at constant temperature.

Q3: What are typical resistance values in circuits?
A: Resistance values range from milliohms (mΩ) in conductors to megaohms (MΩ) in insulators, with common resistors ranging 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: Can Ohm's Law be used for AC circuits?
A: For AC circuits with purely resistive loads, Ohm's Law applies directly. For reactive components, impedance calculations are needed.