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Ohm's Law Resistance Formula:
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Ohm's Law describes the relationship between voltage, current, and resistance in an electrical circuit. The resistance formula R = V/I is fundamental to electrical engineering and circuit analysis, allowing calculation of resistance when voltage and current are known.
The calculator uses Ohm's Law formula:
Where:
Explanation: The formula shows that resistance equals voltage divided by current. This linear relationship forms the basis of DC circuit analysis.
Details: Accurate resistance calculation is crucial for circuit design, component selection, power management, and troubleshooting electrical systems. It helps determine appropriate resistor values and predict circuit behavior.
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 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 AC circuits?
A: Ohm's Law applies to AC circuits with resistive loads, but for reactive components (inductors, capacitors), impedance calculations are needed.
Q3: What is a typical resistance range?
A: Resistance values range from milliohms (mΩ) in conductors to megaohms (MΩ) in insulators, depending on the material and application.
Q4: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. For semiconductors, resistance typically decreases with temperature.
Q5: Can I use this formula for parallel and series circuits?
A: This formula calculates individual resistance. For series circuits, total resistance is the sum. For parallel circuits, reciprocal of total resistance equals sum of reciprocals.