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.

2. How Does the Calculator Work?

The calculator uses Ohm's Law equation:

Where:

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

Explanation: The equation shows the relationship between voltage, current, and resistance in an electrical circuit.

3. Importance of Current Calculation

Details: Calculating current is essential for circuit design, electrical safety, and determining appropriate wire sizes and component ratings.

4. Using the Calculator

Tips: Enter voltage in volts (V) and resistance in ohms (Ω). All values must be positive numbers.

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 is not physically possible.

Q2: Does this work for AC and DC circuits?
A: This calculator works for DC circuits and AC circuits with purely resistive loads. For reactive loads, impedance must be considered.

Q3: What are typical current values in household circuits?
A: Household circuits typically carry 15-20 amps at 120V (North America) or 230V (many other countries).

Q4: How does temperature affect the calculation?
A: Resistance changes with temperature for many materials. For precise calculations, the resistance at the operating temperature should be used.

Q5: Can I calculate voltage if I know current and resistance?
A: Yes, using the rearranged formula: V = I × R