1. What is Ohm's Law?

Ohm's Law is a fundamental principle in electrical engineering 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 the Ohm's Law formula:

Where:

• \( R \) — Resistance in Ohms (Ω)
• \( V \) — Voltage in Volts (V)
• \( I \) — Current in Amperes (A)

Explanation: The formula shows that resistance equals voltage divided by current. This relationship is linear for ohmic conductors.

3. Importance of Resistance Calculation

Details: Calculating resistance is crucial for circuit design, component selection, power management, and ensuring electrical safety in various applications from household electronics to industrial systems.

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 for resistance, voltage, and current?
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: No, Ohm's Law applies only to ohmic conductors. Non-ohmic materials like diodes and transistors do not follow this linear relationship.

Q3: What is a typical resistance range for common components?
A: Resistors range from milliohms (mΩ) to megaohms (MΩ), depending on application and component type.

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

Q5: Can I use this calculator for AC circuits?
A: For AC circuits with purely resistive loads, yes. For circuits with capacitive or inductive elements, impedance calculations are needed instead.