1. What is Ohm's Law?

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

2. How Does the Calculator Work?

The calculator uses the Ohm's Law formula:

Where:

• \( V \) — Voltage (Volts)
• \( I \) — Current (Amps)
• \( R \) — Resistance (Ohms)

Explanation: This equation shows that voltage increases linearly with both current and resistance. For a given resistance, higher current results in higher voltage, and for a given current, higher resistance results in higher voltage.

3. Importance of Voltage Calculation

Details: Accurate voltage calculation is essential for circuit design, component selection, safety analysis, and troubleshooting electrical systems. Understanding voltage requirements helps prevent equipment damage and ensures proper circuit operation.

4. Using the Calculator

Tips: Enter current in Amps and resistance in Ohms. Both values must be positive numbers greater than zero. The calculator will compute the voltage in Volts.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between AC and DC voltage?
A: DC (Direct Current) voltage flows in one direction constantly, while AC (Alternating Current) voltage changes direction periodically. Ohm's Law applies to both, but AC calculations may involve additional factors like impedance.

Q2: Can I use this calculator for AC circuits?
A: This calculator is designed for DC circuits. For AC circuits with resistive loads only, it can provide approximate values, but for reactive components (inductors, capacitors), you need to consider impedance.

Q3: What are typical voltage ranges in DC circuits?
A: Common DC voltages include 1.5V (batteries), 5V (USB), 12V (automotive), 24V (industrial), and 48V (telecommunications). Higher voltages are used in power transmission.

Q4: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. This calculator assumes constant resistance. For precise calculations at different temperatures, you may need to adjust resistance values.

Q5: What safety precautions should I take when working with DC voltage?
A: Always de-energize circuits before working on them, use appropriate personal protective equipment, understand the circuit you're working with, and never exceed component voltage ratings.