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Ohm's Law:
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Ohm's Law is a fundamental principle in electrical engineering that defines 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 resistance equals voltage divided by current. This relationship is linear for ohmic conductors at constant temperature.
Details: Accurate resistance calculation is crucial for circuit design, troubleshooting electrical systems, selecting appropriate components, and ensuring electrical safety in various applications.
Tips: Enter voltage in volts (V) and current in amperes (A). Both values must be positive numbers greater than zero for accurate calculation.
Q1: What are the units for resistance calculation?
A: Resistance is measured in ohms (Ω), voltage in volts (V), and current in amperes (A).
Q2: Does Ohm's Law apply to all materials?
A: Ohm's Law applies to ohmic conductors (like metals) but not to non-ohmic materials (like semiconductors and diodes) where resistance varies with voltage.
Q3: What is the relationship between the three variables?
A: Resistance is directly proportional to voltage and inversely proportional to current. Higher voltage with same current means higher resistance.
Q4: Can I use this calculator for AC circuits?
A: This calculator works for DC circuits and AC circuits with purely resistive loads. For reactive components, impedance calculations are needed.
Q5: What are typical resistance values in circuits?
A: Resistance values range from milliohms (mΩ) in conductors to megaohms (MΩ) in insulators, with common resistors typically between 1Ω and 10MΩ.