1. What is Ohm's Law?

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

Where:

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

Explanation: The resistance is calculated by dividing the voltage by the current flowing through the circuit.

3. Importance of Resistance Calculation

Details: Calculating resistance is crucial for designing electrical circuits, selecting appropriate components, ensuring safety, and troubleshooting electrical systems. It helps engineers determine the proper resistors needed for 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 are the units for resistance?
A: Resistance is measured in Ohms (Ω). Common multiples include kilo-ohms (kΩ) and mega-ohms (MΩ).

Q2: Can Ohm's Law be used for AC circuits?
A: Ohm's Law applies to both DC and AC circuits, but for AC circuits, impedance (which includes resistance, capacitance, and inductance) should be considered.

Q3: What is the relationship between the three variables?
A: Voltage = Current × Resistance (V = I × R). The formula can be rearranged to solve for any of the three variables.

Q4: When does Ohm's Law not apply?
A: Ohm's Law doesn't apply to non-ohmic materials like diodes and transistors, or when temperature significantly affects resistance.

Q5: What are typical resistance values in circuits?
A: Resistance values range from fractions of an ohm (conductors) to millions of ohms (insulators), depending on the application and component type.