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Electric Power Formula:
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Electric power is the rate at which electrical energy is transferred by an electric circuit. It represents the amount of work done by an electrical system per unit time and is measured in watts (W).
The calculator uses the fundamental electric power formula:
Where:
Explanation: This formula calculates the power consumed or produced in an electrical circuit by multiplying the voltage across the circuit by the current flowing through it.
Details: Calculating electric power is essential for designing electrical systems, determining energy consumption, sizing electrical components, and ensuring electrical safety in various applications from household appliances to industrial machinery.
Tips: Enter voltage in volts (V) and current in amperes (A). Both values must be positive numbers greater than zero for accurate calculation.
Q1: What is the difference between AC and DC power calculation?
A: For DC circuits, P = V × I directly. For AC circuits with resistive loads, it's the same, but for reactive loads, power factor must be considered (P = V × I × PF).
Q2: How is electric power related to energy?
A: Energy (in watt-hours) = Power (in watts) × Time (in hours). Power is the rate of energy consumption or production.
Q3: What are typical power ratings for household appliances?
A: LED bulb: 5-15W, Laptop: 50-100W, Refrigerator: 100-400W, Microwave: 800-1500W, Electric heater: 1000-2000W.
Q4: Can this formula be used for three-phase systems?
A: For balanced three-phase systems, use P = √3 × V × I × PF, where V is line voltage and I is line current.
Q5: What safety considerations are important when measuring voltage and current?
A: Always use proper safety equipment, ensure circuits are de-energized when possible, use appropriately rated meters, and follow electrical safety protocols to prevent electric shock.