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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 equation shows that current increases with higher voltage and decreases with higher resistance, following a simple linear relationship.
Details: Accurate current calculation is essential for circuit design, component selection, safety analysis, and ensuring proper operation of electrical devices without overloading components.
Tips: Enter voltage in volts and resistance in ohms. Both values must be positive numbers greater than zero. The calculator will compute the current in amperes.
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: Does Ohm's Law apply to all electrical components?
A: Ohm's Law applies to ohmic materials and components where resistance remains constant. It may not apply to non-ohmic components like diodes and transistors.
Q3: What is the typical current range for household circuits?
A: Most household circuits operate at 15-20 amperes, though specific devices may draw different amounts of current.
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 calculator for AC circuits?
A: This calculator uses the DC version of Ohm's Law. For AC circuits with reactive components, impedance calculations are more appropriate.