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.

2. How Does the Calculator Work?

The calculator uses Ohm's Law equation:

Where:

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

Explanation: The equation calculates electrical resistance by dividing voltage by current flowing through a circuit.

3. Importance of Resistance Calculation

Details: Accurate resistance calculation is crucial for circuit design, troubleshooting electrical systems, component selection, and ensuring proper operation of electronic devices.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is the unit of resistance?
A: Resistance is measured in ohms (Ω), named after German physicist Georg Ohm.

Q2: Can Ohm's Law be applied 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 are typical resistance values in circuits?
A: Resistance values can range from milliohms (mΩ) in conductors to megaohms (MΩ) in insulators, depending on the application.

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

Q5: What is the relationship between power and resistance?
A: Electrical power can be calculated as P = V²/R or P = I²R, showing how resistance affects power dissipation in circuits.