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. 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:

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

Explanation: The equation shows that current increases with higher voltage and decreases with higher resistance.

3. Importance of Current Calculation

Details: Calculating current is essential for designing electrical circuits, selecting appropriate wire gauges, determining power requirements, and ensuring safety in electrical systems.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What if my resistance is zero?
A: Resistance cannot be zero in this calculation as it would result in division by zero (infinite current), which represents a short circuit.

Q2: Does this work for AC circuits?
A: This simple form works for DC circuits. For AC circuits, you need to consider impedance which includes resistance, capacitance, and inductance.

Q3: What are typical current values in household circuits?
A: Typical household circuits in the US carry 15-20 amps at 120 volts for most outlets and lighting circuits.

Q4: How does temperature affect the calculation?
A: Resistance changes with temperature for most materials. For precise calculations, you may need to account for temperature coefficients.

Q5: Can I use this to calculate power?
A: Not directly, but power (P) can be calculated using P = V × I once you know the current.