1. What is Ohm's Law?

Ohm's Law is a fundamental principle in electrical engineering that states 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 Ohm's Law equation:

Where:

• \( R \) — Resistance (Ohms, Ω)
• \( V \) — Voltage (Volts, V)
• \( I \) — Current (Amperes, A)

Explanation: The equation shows that resistance equals voltage divided by current, providing a simple way to calculate electrical resistance in a circuit.

3. Importance of Resistance Calculation

Details: Calculating resistance is essential for designing electrical circuits, troubleshooting electrical problems, and ensuring proper component selection in 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 units of measurement for resistance?
A: Resistance is measured in Ohms (Ω). Larger values may be expressed in kiloohms (kΩ) or megaohms (MΩ).

Q2: Does Ohm's Law apply to all materials?
A: Ohm's Law applies to "ohmic" materials where resistance remains constant regardless of voltage. Some materials like semiconductors are non-ohmic.

Q3: What is the relationship between resistance, voltage and current?
A: Resistance is directly proportional to voltage and inversely proportional to current. Higher voltage with constant current means higher resistance.

Q4: How accurate is this calculation?
A: The calculation is mathematically precise for DC circuits with constant resistance. Real-world factors like temperature may affect actual resistance values.

Q5: Can I calculate voltage or current using this formula?
A: Yes, the formula can be rearranged to solve for any variable: V = I×R or I = V/R.