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 formula:

Where:

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

Explanation: The formula 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 and current in amps. 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 resistance be negative?
A: In most conventional materials, resistance is always positive. Some special components like tunnel diodes can exhibit negative differential resistance under certain conditions.

Q3: What affects resistance in a conductor?
A: Resistance depends on the material's resistivity, length, cross-sectional area, and temperature.

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 difference between AC and DC resistance?
A: DC resistance is constant, while AC resistance (impedance) can vary with frequency due to inductive and capacitive effects in the circuit.