1. What is Single Phase Current Calculation?

Definition: This calculator determines the electrical current in amps for single-phase AC circuits based on power, voltage, and power factor.

Purpose: It helps electricians, engineers, and DIYers properly size wires, circuit breakers, and other electrical components.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( I \) — Current (amps)
• \( P_{kW} \) — Power (kilowatts)
• \( V \) — Voltage (volts)
• \( PF \) — Power factor (unitless, 0-1)

Explanation: The power in kW is converted to watts (×1000), then divided by the product of voltage and power factor to get current.

3. Importance of Current Calculation

Details: Accurate current calculation ensures electrical safety, prevents circuit overloads, and helps select proper wire gauges and protection devices.

4. Using the Calculator

Tips: Enter the power in kW, system voltage (typically 120V or 240V for residential), and power factor (default 0.95). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is power factor?
A: Power factor represents the ratio of real power to apparent power, ranging from 0 to 1. Most systems aim for 0.95 or higher.

Q2: When would I use a different power factor?
A: Use lower values for inductive loads (motors, transformers) or when power factor correction isn't applied.

Q3: What's the 1000 factor in the formula?
A: This converts kilowatts to watts (1 kW = 1000 watts) since voltage is in volts and current in amps.

Q4: Does this work for DC circuits?
A: For DC, use the simpler formula I = P/V (power factor is always 1 in pure DC circuits).

Q5: How do I find the power if I know current?
A: Rearrange the formula: P = I × V × PF / 1000 (result in kW).