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Ohm's Law Formula:
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Ohm's Law is a fundamental principle in electrical engineering that describes the relationship between voltage (V), current (I), and resistance (R) 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 and inversely proportional to the resistance between them.
The calculator uses the Ohm's Law equation:
Where:
Explanation: The calculator automatically calculates the missing value when you provide any two of the three variables (voltage, current, resistance).
Details: Ohm's Law is essential for designing and analyzing electrical circuits, troubleshooting electrical problems, and understanding how electrical components interact in various applications from simple circuits to complex electronic systems.
Tips: Enter any two known values (voltage, current, or resistance) and leave the third field empty. The calculator will compute the missing value automatically. All values must be positive numbers.
Q1: What are the units used in Ohm's Law?
A: Voltage is measured in volts (V), current in amperes (A), and resistance in ohms (Ω).
Q2: Can Ohm's Law be applied to AC circuits?
A: Yes, but with modifications for impedance in AC circuits. The basic V=IR relationship holds for resistive components.
Q3: What is the power formula related to Ohm's Law?
A: Power (P) can be calculated as P = V × I, or using variations: P = I² × R or P = V² / R.
Q4: Are there limitations to Ohm's Law?
A: Ohm's Law applies to ohmic materials where resistance remains constant. It doesn't apply to non-ohmic materials like diodes and transistors.
Q5: How accurate is this calculator?
A: The calculator provides precise calculations based on the input values. For real-world applications, consider component tolerances and measurement errors.