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 (Ω)
• \( V \) — Voltage (V)
• \( I \) — Current (A)

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

3. Importance of Resistance Calculation

Details: Accurate resistance calculation is crucial for circuit design, troubleshooting electrical systems, 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 is the unit of measurement for resistance?
A: Resistance is measured in ohms (Ω), named after German physicist Georg Ohm.

Q2: Can Ohm's Law be applied to all electrical circuits?
A: Ohm's Law applies to ohmic conductors where resistance remains constant. It may not accurately describe non-ohmic materials like semiconductors.

Q3: What are typical resistance values in electrical circuits?
A: Resistance values can range from milliohms (mΩ) in conductors to megaohms (MΩ) in insulators, depending on the material and application.

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

Q5: What's the relationship between power and resistance?
A: Electrical power (P) can be calculated using P = I²R or P = V²/R, showing that power dissipation increases with resistance when current or voltage is constant.