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The power equation (P = I × V) calculates electrical power in watts from current (in amperes) and voltage (in volts). It's a fundamental formula in electrical engineering and physics that describes the relationship between these three essential electrical quantities.
The calculator uses the power equation:
Where:
Explanation: This equation shows that power is directly proportional to both current and voltage. Increasing either current or voltage will increase the power output.
Details: Calculating power is essential for designing electrical systems, determining energy consumption, selecting appropriate components, and ensuring electrical safety in various applications from household appliances to industrial equipment.
Tips: Enter current in amperes and voltage in volts. Both values must be positive numbers. The calculator will compute the power in watts.
Q1: What is the difference between AC and DC power calculations?
A: For DC circuits, P = I × V directly. For AC circuits, power factor must be considered: P = I × V × PF, where PF is the power factor.
Q2: Can this calculator be used for three-phase systems?
A: For balanced three-phase systems, use P = √3 × I × V × PF. This calculator is designed for single-phase DC or resistive AC circuits.
Q3: What are typical power ratings for household appliances?
A: Common household appliances range from 5W (LED bulb) to 3000W (electric heater). Always check manufacturer specifications for exact power requirements.
Q4: How does power relate to energy consumption?
A: Energy consumption is power multiplied by time (E = P × t). Power measured in watts, energy measured in watt-hours (Wh) or kilowatt-hours (kWh).
Q5: Why is power calculation important for circuit design?
A: Proper power calculation ensures components are not overloaded, helps select appropriate wire sizes, and determines cooling requirements for electrical devices.