1. What is Ohm's Law?

Ohm's Law is a fundamental principle in electrical engineering and physics 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 (Ω)
• \( V \) — Voltage (V)
• \( I \) — Current (A)

Explanation: The equation shows that resistance equals voltage divided by current. This relationship is linear for ohmic conductors at constant temperature.

3. Importance of Resistance Calculation

Details: Calculating resistance is crucial for designing electrical circuits, troubleshooting electrical problems, selecting appropriate components, and ensuring electrical safety in various applications.

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?
A: Resistance is measured in ohms (Ω), voltage in volts (V), and current in amperes (A).

Q2: Does Ohm's Law apply to all materials?
A: Ohm's Law applies to ohmic materials (like most metals) but not to non-ohmic materials (like diodes and transistors) where resistance changes with voltage.

Q3: What is the relationship between power and resistance?
A: Electrical power can be calculated as P = V²/R or P = I²R, showing how power relates to resistance in a circuit.

Q4: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. For semiconductors, resistance typically decreases with temperature.

Q5: 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.