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Electrical Current Formula:
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The formula I = P/V (Current equals Power divided by Voltage) is a fundamental equation in electrical engineering that calculates the electric current in amperes when the power in watts and voltage in volts are known.
The calculator uses the basic electrical power formula:
Where:
Explanation: This formula comes from the basic definition of electrical power where power equals voltage times current (P = V × I). By rearranging the formula, we can solve for current.
Details: Calculating current is essential for designing electrical circuits, selecting appropriate wire sizes, choosing circuit breakers, and ensuring electrical safety. It helps prevent overheating and potential fire hazards.
Tips: Enter power in watts and voltage in volts. Both values must be positive numbers. The calculator will compute the current in amperes.
Q1: Can this formula be used for both AC and DC circuits?
A: For DC circuits and AC circuits with purely resistive loads, yes. For AC circuits with reactive components, you need to consider power factor.
Q2: What is the difference between watts and volt-amps?
A: Watts represent real power, while volt-amps represent apparent power. They are equal in DC circuits or AC circuits with unity power factor.
Q3: How does current relate to wire size?
A: Higher currents require thicker wires to safely carry the current without overheating. Electrical codes specify maximum current for each wire gauge.
Q4: What happens if voltage is zero in the calculation?
A: The formula would require division by zero, which is undefined. In practice, zero voltage means no current will flow.
Q5: Can I calculate power if I know current and voltage?
A: Yes, using the formula P = V × I. This is the basic power formula from which our calculation is derived.