1. What is Ohm's Law?

Ohm's Law 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. It provides a simple mathematical relationship between voltage, current, and resistance in an electrical circuit.

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: The equation shows that resistance equals voltage divided by current. This fundamental relationship governs how electrical circuits behave.

3. Importance of Resistance Calculation

Details: Calculating resistance is essential for designing and analyzing electrical circuits, selecting appropriate components, and troubleshooting electrical systems.

4. Using the Calculator

Tips: Enter voltage in volts and current in amperes. Both values must be positive numbers. The calculator will compute the resistance in ohms.

5. Frequently Asked Questions (FAQ)

Q1: What are typical resistance values in circuits?
A: Resistance values can range from milliohms (mΩ) in conductors to megaohms (MΩ) in insulators, depending on the material and application.

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

Q3: How does temperature affect resistance?
A: For conductors, resistance generally increases with temperature. For semiconductors, resistance typically decreases with temperature.

Q4: Can I calculate power from these values?
A: Yes, power (P) can be calculated as P = V×I or P = I²×R or P = V²/R once you know any two of the three variables.

Q5: What if my circuit has multiple resistors?
A: For series circuits, add resistances. For parallel circuits, use the reciprocal formula (1/R_total = 1/R1 + 1/R2 + ...).