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 (amps)

Explanation: The equation calculates electrical resistance by dividing the voltage by the current flowing through the 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 are the units for resistance?
A: Resistance is measured in ohms (Ω), which represents the opposition to current flow in an electrical circuit.

Q2: Can Ohm's Law be used for AC circuits?
A: Ohm's Law applies to both DC circuits and AC circuits with resistive loads. For reactive components in AC circuits, impedance calculations are needed.

Q3: What is the relationship between power and resistance?
A: Power (P) can be calculated using P = V²/R or P = I²R, showing that power dissipation increases with either voltage squared or current squared divided by resistance.

Q4: Are there limitations to Ohm's Law?
A: Ohm's Law applies to ohmic materials where resistance remains constant. It doesn't apply to non-ohmic materials like diodes and transistors where resistance varies with voltage.

Q5: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. For semiconductors, resistance typically decreases with temperature increase.