1. What is the Power Formula?

The power formula (P = V × I × PF) calculates the real power consumption of electrical appliances by multiplying voltage (V), current (I), and power factor (PF). This gives the actual power being used in watts.

2. How Does the Calculator Work?

The calculator uses the power formula:

Where:

• \( P \) — Power in watts (W)
• \( V \) — Voltage in volts (V)
• \( I \) — Current in amperes (A)
• \( PF \) — Power factor (unitless, 0 to 1)

Explanation: For purely resistive loads (like incandescent bulbs), PF=1. For inductive loads (like motors), PF is typically between 0 and 1.

3. Importance of Power Calculation

Details: Calculating power consumption helps in sizing electrical systems, estimating energy costs, and ensuring circuit safety by not exceeding rated capacities.

4. Using the Calculator

Tips: Enter voltage in volts, current in amperes, and power factor (1 for resistive loads). All values must be valid (voltage > 0, current > 0, PF between 0-1).

5. Frequently Asked Questions (FAQ)

Q1: What is power factor?
A: Power factor is the ratio of real power to apparent power, representing how effectively current is converted to useful work.

Q2: Why is power factor important?
A: Low power factor means more current is needed for the same real power, increasing energy losses in distribution systems.

Q3: What's typical power factor for household appliances?
A: Resistive loads (heaters, bulbs) have PF=1. Motors typically 0.7-0.9. Electronics often 0.6-0.8.

Q4: How can I measure current?
A: Use a clamp meter or multimeter. For accurate results, measure under normal operating conditions.

Q5: Does this work for DC circuits?
A: Yes, but for DC, power factor is always 1 (P = V × I).