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Ohm's Law:
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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. The formula is expressed as V = I × R.
The calculator uses Ohm's Law equation:
Where:
Explanation: Enter any two known values to calculate the third unknown value. The calculator will automatically compute the missing parameter.
Details: Ohm's Law is fundamental to electrical engineering and circuit analysis. It helps in designing electrical circuits, troubleshooting electrical problems, and understanding the relationship between voltage, current, and resistance in electrical systems.
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 (A), and resistance in ohms (Ω).
Q2: Can Ohm's Law be applied to AC circuits?
A: Yes, but for AC circuits with reactive components, impedance (which includes resistance and reactance) is used instead of pure resistance.
Q3: What is the relationship between power and Ohm's Law?
A: Electrical power (P) can be calculated using P = V × I, and by substituting Ohm's Law, we get 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 where resistance varies with voltage or current.
Q5: How accurate is this calculator?
A: The calculator provides precise calculations based on the input values. For real-world applications, consider factors like temperature effects on resistance and measurement tolerances.