1. What is Ohm's Law?

Ohm's Law is a fundamental principle in electrical engineering that defines 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 and inversely proportional to the resistance between them.

2. How Does the Calculator Work?

The calculator uses the Ohm's Law equation:

Where:

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

Explanation: The equation shows that current increases with higher voltage and decreases with higher resistance.

3. Importance of Current Calculation

Details: Accurate current calculation is essential for circuit design, electrical safety analysis, component selection, and troubleshooting electrical systems.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What are the units of measurement in Ohm's Law?
A: Voltage is measured in volts (V), current in amperes (A), and resistance in ohms (Ω).

Q2: Can Ohm's Law be applied to AC circuits?
A: Yes, but for AC circuits with reactive components, impedance (which includes resistance and reactance) should be used instead of pure resistance.

Q3: What is the relationship between power and Ohm's Law?
A: Power (P) can be calculated as P = V×I, and when combined with Ohm's Law, also as P = I²×R or P = V²/R.

Q4: Are there limitations to Ohm's Law?
A: Ohm's Law applies to ohmic materials where resistance remains constant. It doesn't apply to non-ohmic materials like diodes and transistors where resistance varies with voltage.

Q5: Why is current represented by the letter I?
A: The letter I comes from the French phrase "intensité de courant" meaning current intensity, which was used by early electrical researchers.