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Ohm's Law:
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Electric resistance is a measure of the opposition to the flow of electric current in a circuit. It is measured in ohms (Ω) and is a fundamental property of electrical components and materials.
The calculator uses Ohm's Law:
Where:
Explanation: Ohm's Law 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.
Details: Calculating resistance is essential for designing electrical circuits, selecting appropriate components, ensuring safety, and troubleshooting electrical systems. It helps prevent circuit overloads and component damage.
Tips: Enter voltage in volts (V) and current in amperes (A). Both values must be positive numbers greater than zero. The calculator will compute the resistance in ohms (Ω).
Q1: What Is The Difference Between Resistance And Resistivity?
A: Resistance is the property of a specific component or circuit, while resistivity is an intrinsic property of a material that determines how strongly it resists electric current.
Q2: What Are Typical Resistance Values In Electronic Circuits?
A: Resistance values can range from milliohms (mΩ) in conductors to megaohms (MΩ) in insulators, with common resistor values typically between 1Ω and 10MΩ.
Q3: How Does Temperature Affect Resistance?
A: For most conductors, resistance increases with temperature. For semiconductors, resistance typically decreases with temperature increase.
Q4: What Factors Determine The Resistance Of A Material?
A: Resistance depends on the material's resistivity, length, cross-sectional area, and temperature.
Q5: Can Resistance Be Negative?
A: In ordinary materials, resistance is always positive. However, some specialized electronic components can exhibit negative resistance under certain conditions.