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Electric Power Formula:
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The electric power consumption formula P = V × I calculates the electrical power in watts, where P represents power, V represents voltage, and I represents current. This fundamental equation is used to determine the rate at which electrical energy is consumed or produced in a circuit.
The calculator uses the electric power formula:
Where:
Explanation: This formula represents the basic relationship in electrical circuits where power is the product of voltage and current flowing through a component.
Details: Accurate power calculation is essential for circuit design, electrical safety, energy consumption analysis, and proper sizing of electrical components and wiring.
Tips: Enter voltage in volts and current in amperes. 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 applies directly. For AC circuits with resistive loads, it also applies, but for reactive loads, power factor must be considered.
Q2: How is this related to energy consumption?
A: Energy consumption is power multiplied by time (E = P × t). Power tells you the rate of energy use, while energy tells you the total amount used over time.
Q3: What are typical power values 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, the formula becomes P = √3 × V × I × PF, where PF is the power factor.
Q5: What safety considerations are important?
A: Always ensure circuits are properly rated for calculated power, use appropriate fuses or breakers, and follow electrical safety standards to prevent overheating and fire hazards.