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Coulombs Formula:
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The Coulombs equation calculates electric charge using the formula Q = I × t, where Q is the charge in coulombs, I is the current in amperes, and t is the time in seconds. This fundamental equation in electromagnetism relates the flow of electric current to the total charge transferred.
The calculator uses the Coulombs equation:
Where:
Explanation: The equation demonstrates that the total charge transferred is directly proportional to both the current flowing and the duration of time the current flows.
Details: Calculating electric charge is essential in electrical engineering, circuit design, battery capacity measurement, and understanding electrochemical processes. It helps determine the amount of electricity consumed or stored in various applications.
Tips: Enter current in amperes and time in seconds. Both values must be positive numbers. The calculator will compute the total charge in coulombs.
Q1: What is a coulomb exactly?
A: A coulomb is the SI unit of electric charge, equivalent to the charge transferred by a constant current of one ampere in one second.
Q2: Can this formula be used for alternating current?
A: For AC circuits, the calculation is more complex as current varies with time. This simple formula applies to direct current (DC) or the average charge transfer in AC over a specific time period.
Q3: How is this related to battery capacity?
A: Battery capacity is often measured in ampere-hours (Ah), which can be converted to coulombs (1 Ah = 3600 C), showing the total charge a battery can deliver.
Q4: What's the relationship between coulombs and electron charge?
A: One coulomb equals approximately 6.242 × 10¹⁸ elementary charges (electron charges), which is Avogadro's number of electrons.
Q5: Are there limitations to this equation?
A: This equation assumes constant current. For varying currents, integration of current over time is required to calculate the total charge.