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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.
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: Calculating resistance is crucial for circuit design, component selection, troubleshooting electrical systems, and ensuring proper operation of electronic devices. It helps prevent circuit damage and ensures optimal performance.
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 are typical resistance values in circuits?
A: Resistance values range from milliohms in power circuits to megaohms in high-impedance circuits, depending on the application.
Q2: Does temperature affect resistance?
A: Yes, for most conductors, resistance increases with temperature. For semiconductors, resistance typically decreases with temperature.
Q3: What is the difference between resistance and impedance?
A: Resistance applies to DC circuits, while impedance applies to AC circuits and includes both resistance and reactance components.
Q4: When is Ohm's Law not applicable?
A: Ohm's Law doesn't apply to non-ohmic materials like diodes and transistors, or when temperature changes significantly affect resistance.
Q5: How do I measure resistance in a circuit?
A: Use a multimeter set to resistance mode, ensuring the circuit is powered off and components are isolated for accurate measurements.