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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 and inversely proportional to the resistance between them.
The calculator uses Ohm's Law equation:
Where:
Explanation: The calculator allows you to input any two known values and will calculate the missing third value using the appropriate rearrangement of the Ohm's Law formula.
Details: Ohm's Law is essential for designing and analyzing electrical circuits, troubleshooting electrical problems, and ensuring proper component selection in electronic devices. It forms the foundation for understanding electrical behavior in various applications.
Tips: Enter any two known values (voltage, current, or resistance) and leave the third field empty. The calculator will compute the missing value. 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 (amps, A), and resistance in ohms (Ω).
Q2: Can Ohm's Law be applied to all electrical components?
A: Ohm's Law applies to ohmic conductors where the resistance remains constant. It may not accurately describe non-ohmic components like diodes and transistors.
Q3: What is the power formula related to Ohm's Law?
A: Electrical power can be calculated as P = V × I, or using variations: P = I² × R or P = V² / R.
Q4: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. For semiconductors, resistance typically decreases with temperature.
Q5: What are typical resistance values in circuits?
A: Resistance values can range from milliohms in conductors to megaohms in insulators, depending on the material and application.