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Single Phase Current Formula:
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The single phase current calculation determines the electrical current flowing in a single-phase AC or DC circuit based on the power consumed and the voltage applied. This fundamental electrical formula is essential for circuit design, load analysis, and electrical safety assessments.
The calculator uses the single phase current formula:
Where:
Explanation: This formula represents Ohm's Law for power circuits, showing the direct relationship between current, power, and voltage in single-phase electrical systems.
Details: Accurate current calculation is crucial for proper wire sizing, circuit breaker selection, electrical load management, and ensuring electrical system safety and efficiency.
Tips: Enter power in watts and voltage in volts. Both values must be positive numbers. The calculator will compute the current in amperes.
Q1: What is the difference between single-phase and three-phase current calculation?
A: Single-phase uses I = P/V, while three-phase uses I = P/(√3 × V × PF) where PF is power factor. Three-phase systems are more efficient for high-power applications.
Q2: Does this formula work for both AC and DC circuits?
A: For DC circuits, yes. For AC circuits, this assumes resistive loads with unity power factor. For reactive loads, power factor must be considered.
Q3: What are typical current values in residential applications?
A: Residential circuits typically range from 15A to 30A for branch circuits, with main services from 100A to 200A depending on home size and electrical demands.
Q4: How does wire size relate to current calculation?
A: Wire size must be selected based on calculated current to prevent overheating. National Electrical Code (NEC) provides ampacity tables for proper wire sizing.
Q5: What safety considerations are important?
A: Always include safety margins, use proper circuit protection, ensure adequate wire sizing, and follow local electrical codes and regulations.