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 designing electrical circuits, selecting appropriate components, troubleshooting electrical problems, and ensuring circuit safety and efficiency.

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 Ohm's Law be used for AC circuits?
A: Ohm's Law applies to both DC and AC circuits, but for AC circuits, it uses impedance rather than pure resistance.

Q3: What is the relationship between the three variables?
A: Voltage = Current × Resistance (V = I × R). The three variables are interrelated - knowing any two allows calculation of the third.

Q4: When does Ohm's Law not apply?
A: Ohm's Law doesn't apply to non-ohmic materials like diodes and transistors, or in circuits with changing temperatures or magnetic fields.

Q5: What are typical resistance values?
A: Resistance values vary widely - from milliohms in conductors to megaohms in insulators, depending on the material and application.