1. What is Ohm's Law?

Definition: Ohm's Law states that the voltage across a conductor is directly proportional to the current flowing through it, with resistance being the constant of proportionality.

Purpose: It's a fundamental principle in electrical engineering used to calculate voltage, current, or resistance in DC circuits.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The current multiplied by resistance gives the voltage drop across a circuit element.

3. Importance of Ohm's Law

Details: Understanding Ohm's Law is essential for designing electrical circuits, troubleshooting problems, and ensuring proper component selection.

4. Using the Calculator

Tips: Enter the current in amps and resistance in ohms. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Does Ohm's Law apply to AC circuits?
A: Ohm's Law applies to AC circuits with purely resistive loads. For reactive components (inductors, capacitors), impedance must be considered.

Q2: What's a typical resistance value?
A: Resistance values vary widely depending on the component - from milliohms in wires to megaohms in insulators.

Q3: Can I calculate current if I know voltage and resistance?
A: Yes, the formula can be rearranged as \( I = V / R \).

Q4: What units should I use?
A: Use amps for current, ohms for resistance, and volts for voltage. The calculator will give results in volts.

Q5: Why is my calculated voltage different from measured?
A: Real-world factors like temperature, wire resistance, and power supply limitations can cause differences.