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Ohm's Law Equation:
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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 the 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 troubleshooting electrical systems. It helps prevent component damage and ensures proper circuit operation.
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 materials?
A: Ohm's Law applies to ohmic materials where resistance remains constant regardless of voltage. Some materials (diodes, transistors) are non-ohmic and don't follow this linear relationship.
Q3: What is the typical range of current values?
A: Current values can range from microamperes (μA) in small electronic circuits to amperes (A) in power systems, and even kiloamperes (kA) in industrial applications.
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 basic DC form of Ohm's Law. For AC circuits with reactive components, you would need to use impedance (Z) instead of resistance (R).