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 Ohm's Law equation:

Where:

• \( R \) — Electrical 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 Electrical Resistance Calculation

Details: Calculating electrical 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. The calculator will compute the resistance in ohms (Ω).

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: Ohm's Law applies to ohmic conductors (like metals) but may not accurately describe non-ohmic materials like semiconductors or diodes.

Q3: What is the typical resistance range for common components?
A: Resistors range from milliohms to megaohms, while conductors have very low resistance and insulators have very high resistance.

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: This calculator uses the DC form of Ohm's Law. For AC circuits with reactive components, impedance calculations are needed instead.