1. What is the Current Formula?

The formula I = P / V calculates electrical current in amps from power in watts and voltage in volts. This applies to DC circuits or AC circuits with power factor of 1.

2. How Does the Calculator Work?

The calculator uses the fundamental electrical formula:

Where:

• \( I \) — Current in amperes (amps)
• \( P \) — Power in watts
• \( V \) — Voltage in volts

Explanation: This formula represents Ohm's Law relationship for calculating current when power and voltage are known.

3. Importance of Current Calculation

Details: Calculating current is essential for circuit design, wire sizing, fuse selection, and ensuring electrical safety in both residential and industrial applications.

4. Using the Calculator

Tips: Enter power in watts and voltage in volts. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Does this formula work for AC circuits?
A: Yes, but only for AC circuits with power factor of 1 (resistive loads). For reactive loads, power factor must be considered.

Q2: What are typical current values in household circuits?
A: Typical household circuits are 15-20 amps, while larger appliances may require 30-50 amps depending on voltage and power requirements.

Q3: Why is current calculation important for wire sizing?
A: Wires must be sized to handle the expected current without overheating, which is crucial for fire prevention and electrical safety.

Q4: Can this calculator be used for three-phase systems?
A: For three-phase systems with balanced loads, additional factors like √3 (1.732) must be included in the calculation.

Q5: What safety considerations should be made?
A: Always use appropriately rated circuit breakers or fuses, ensure proper wire sizing, and follow electrical codes for installation safety.