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Ohm's Law Equation:
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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. It provides a simple mathematical relationship between voltage, current, and resistance in an electrical circuit.
The calculator uses the Ohm's Law equation:
Where:
Explanation: The equation shows that resistance equals voltage divided by current. Higher voltage with the same current means higher resistance, while higher current with the same voltage means lower resistance.
Details: Calculating resistance is fundamental in circuit design, troubleshooting electrical systems, selecting appropriate components, and ensuring electrical safety in various applications.
Tips: Enter voltage in volts and current in amps. Both values must be positive numbers. The calculator will compute the resistance in ohms.
Q1: What are typical resistance values in circuits?
A: Resistance values vary widely from milliohms in power systems to megaohms in electronic circuits, depending on the application.
Q2: Does Ohm's Law apply to all materials?
A: No, Ohm's Law applies to "ohmic" materials where resistance is constant. Non-ohmic materials (like diodes) don't follow this linear relationship.
Q3: How does temperature affect resistance?
A: In conductors, resistance typically increases with temperature. In semiconductors, resistance usually decreases with temperature.
Q4: What's the difference between resistance and impedance?
A: Resistance applies to DC circuits, while impedance (which includes resistance, capacitance, and inductance) applies to AC circuits.
Q5: How can I measure resistance directly?
A: You can use a multimeter in resistance mode to measure resistance directly when the circuit is powered off.