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Ohm's Law:
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Ohm's Law is a fundamental principle in electrical engineering that describes the relationship between voltage, current, and resistance in an electrical circuit. It states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them.
The calculator uses Ohm's Law formula:
Where:
Explanation: The formula calculates the electric current flowing through a circuit by dividing the voltage by the resistance.
Details: Accurate current calculation is crucial for circuit design, electrical safety, component selection, and ensuring proper operation of electrical devices. It helps prevent overloading circuits and potential damage to equipment.
Tips: Enter voltage in volts and resistance in ohms. Both values must be positive numbers greater than zero. The calculator will compute the current in amperes.
Q1: What is the unit of current?
A: Current is measured in amperes (A), which is the SI unit for electric current.
Q2: Can I use this calculator for AC circuits?
A: This calculator uses the basic Ohm's Law for DC circuits. For AC circuits with reactive components, additional factors like impedance need to be considered.
Q3: What happens if resistance is zero?
A: If resistance is zero (short circuit), current would theoretically be infinite, which is dangerous and can cause damage. In practice, all circuits have some resistance.
Q4: How accurate is this calculation?
A: The calculation is mathematically precise for ideal conditions. In real-world applications, factors like temperature, material properties, and circuit design may affect actual current values.
Q5: Can I calculate voltage or resistance using this formula?
A: Yes, Ohm's Law can be rearranged to calculate any of the three variables: V = I × R for voltage, and R = V ÷ I for resistance.