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Ohm's Law Formula:
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Ohm's Law states that the resistance (R) in a circuit is equal to the voltage (V) divided by the current (I). This fundamental principle in electrical engineering describes the relationship between voltage, current, and resistance in an electrical circuit.
The calculator uses Ohm's Law formula:
Where:
Explanation: The formula shows that resistance is directly proportional to voltage and inversely proportional to current flowing through a conductor.
Details: Calculating resistance is essential for circuit design, component selection, power management, and troubleshooting electrical systems. It helps engineers determine appropriate resistor values and ensure proper circuit operation.
Tips: Enter voltage in volts and current in amperes. Both values must be positive numbers greater than zero. The calculator will compute the resistance in ohms.
Q1: What is Ohm's Law used for?
A: Ohm's Law is used to calculate the relationship between voltage, current, and resistance in electrical circuits, helping design and analyze electronic systems.
Q2: What are typical resistance values in circuits?
A: Resistance values range from milliohms in conductors to megaohms in insulators, with common resistor values from 1Ω to 10MΩ in electronic circuits.
Q3: Can resistance be negative?
A: In most conventional materials, resistance is positive. Negative resistance occurs only in special devices like tunnel diodes under specific conditions.
Q4: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature, while for semiconductors, resistance typically decreases with temperature.
Q5: What is the difference between resistance and impedance?
A: Resistance applies to DC circuits and represents opposition to current flow, while impedance applies to AC circuits and includes both resistance and reactance components.