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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 in a DC circuit.
Details: Accurate current calculation is crucial for circuit design, component selection, safety analysis, and ensuring proper operation of electrical devices and systems.
Tips: Enter voltage in volts and resistance in ohms. Both values must be positive numbers greater than zero for accurate calculation.
Q1: Does Ohm's Law apply to AC circuits?
A: Ohm's Law applies to resistive AC circuits, but for circuits with capacitors and inductors, impedance must be considered instead of pure resistance.
Q2: What are typical current values in household circuits?
A: Typical household circuits operate at 15-20 amperes, with standard outlets rated for 15A and larger appliances requiring 20A circuits.
Q3: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. For semiconductors, resistance typically decreases with temperature.
Q4: What is the difference between DC and AC current?
A: DC (Direct Current) flows in one direction constantly, while AC (Alternating Current) changes direction periodically, typically 50-60 times per second.
Q5: When should I use this calculator?
A: Use this calculator for DC circuit analysis, electronics projects, electrical troubleshooting, and educational purposes to understand basic electrical relationships.