1. What is Ohm's Law?

Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points, and inversely proportional to the resistance between them. The formula is expressed as R = V/I.

2. How Does the Calculator Work?

The calculator uses the Ohm's Law equation:

Where:

• \( R \) — Resistance in ohms (Ω)
• \( V \) — Voltage in volts (V)
• \( I \) — Current in amperes (A)

Explanation: The equation shows that resistance equals voltage divided by current. Higher voltage with the same current means higher resistance, while higher current with the same voltage means lower resistance.

3. Importance of Resistance Calculation

Details: Calculating resistance is fundamental in electrical engineering and electronics for designing circuits, selecting appropriate components, and troubleshooting electrical systems.

4. Using the Calculator

Tips: Enter voltage in volts and current in amperes. Both values must be positive numbers. The calculator will compute the resistance in ohms.

5. Frequently Asked Questions (FAQ)

Q1: What are the units for Ohm's Law?
A: The standard units are volts (V) for voltage, amperes (A) for current, and ohms (Ω) for resistance.

Q2: Does Ohm's Law apply to all materials?
A: Ohm's Law applies to "ohmic" materials where resistance is constant regardless of voltage. Some materials like semiconductors are non-ohmic.

Q3: What if I know resistance and want to find voltage or current?
A: The equation can be rearranged: V = I×R for voltage, or I = V/R for current.

Q4: How accurate is this calculation?
A: The calculation is mathematically exact, but real-world factors like temperature can affect actual resistance in circuits.

Q5: Can I use this for AC circuits?
A: For AC circuits with only resistive loads, yes. For circuits with capacitors or inductors, impedance calculations are needed instead.