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 equation R = V/I is used to calculate resistance.

2. How Does the Calculator Work?

The calculator uses Ohm's Law equation:

Where:

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

Explanation: The resistance is calculated by dividing the voltage by the 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 amps. Both values must be positive numbers. The calculator will compute the resistance in ohms.

5. Frequently Asked Questions (FAQ)

Q1: What if I know resistance and voltage but need current?
A: You can rearrange the equation to I = V/R. Similarly, V = I×R if you know current and resistance.

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

Q3: What are typical resistance values?
A: Conductors have low resistance (fractions of ohms), insulators have very high resistance (millions of ohms), resistors range from ohms to megaohms.

Q4: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. Some materials like semiconductors show the opposite behavior.

Q5: What's the difference between resistance and impedance?
A: Resistance is for DC circuits, impedance (which includes resistance) is for AC circuits and accounts for frequency-dependent effects.