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:

• \( R \) — Electrical resistance (ohms)
• \( V \) — Voltage (volts)
• \( I \) — Current (amps)

Explanation: The equation shows that resistance is equal to the voltage divided 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 amps. 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), named after Georg Simon Ohm who formulated Ohm's Law.

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 applies to instantaneous values and may require consideration of impedance.

Q3: What is the relationship between the three variables?
A: The three variables are related by the formula: Voltage = Current × Resistance (V = I × R), which can be rearranged to find any one variable if the other two are known.

Q4: When is Ohm's Law not applicable?
A: Ohm's Law may not apply to non-ohmic materials like semiconductors, diodes, and transistors where resistance changes with voltage or current.

Q5: How accurate is this calculation?
A: The calculation is mathematically precise for ohmic conductors under constant temperature conditions. In real-world applications, temperature and material properties may affect accuracy.