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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 equation:
Where:
Explanation: The equation shows that current increases with higher voltage and decreases with higher resistance, following a linear relationship.
Details: Accurate current calculation is crucial for circuit design, component selection, safety analysis, and ensuring electrical systems operate within their rated capacities to prevent overheating and damage.
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 are the units used in Ohm's Law?
A: Current is measured in amperes (A), voltage in volts (V), and resistance in ohms (Ω).
Q2: Can Ohm's Law be used for AC circuits?
A: Ohm's Law applies to both DC and AC circuits, but for AC circuits, impedance should be used instead of resistance for accurate calculations.
Q3: What is the relationship between power and Ohm's Law?
A: Power (P) can be calculated using P = V × I, or by combining with Ohm's Law as P = I² × R or P = V² / R.
Q4: When is Ohm's Law not applicable?
A: Ohm's Law may not apply to non-ohmic materials like semiconductors, diodes, and transistors where resistance changes with voltage or current.
Q5: How accurate is Ohm's Law in real-world applications?
A: Ohm's Law is highly accurate for most metallic conductors at constant temperature, but factors like temperature changes and material properties can affect precision.