1. What is Ohm's Law?

Ohm's Law states that the voltage across a conductor is directly proportional to the current flowing through it, with the constant of proportionality being the resistance. It's a fundamental principle in electrical engineering and physics.

2. How Does the Calculator Work?

The calculator uses the Ohm's Law equation:

Where:

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

Explanation: The voltage across a resistor equals the product of the current flowing through it and its resistance.

3. Importance of Voltage Calculation

Details: Calculating voltage is essential for designing electrical circuits, selecting appropriate components, and ensuring safe operation of electronic devices.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Can I use this for AC circuits?
A: This calculator is for DC circuits. For AC circuits with reactive components, you need to consider impedance (Z) instead of just resistance.

Q2: What if I know voltage and want to find current?
A: You can rearrange the formula: \( I = V / R \). Similarly, \( R = V / I \) if you need to find resistance.

Q3: Does this apply to all materials?
A: Ohm's Law applies to "ohmic" materials where resistance is constant. Some materials like diodes are non-ohmic.

Q4: What are typical resistor values?
A: Resistors commonly range from a few ohms to several megaohms (millions of ohms).

Q5: How precise should my measurements be?
A: For most applications, 1-5% tolerance is sufficient. High-precision circuits may require more accurate measurements.