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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, electrical safety analysis, component selection, and troubleshooting electrical systems. It helps prevent overloading circuits and ensures proper operation of electrical devices.
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 conductors (components with constant resistance). It doesn't apply to non-ohmic devices like diodes and transistors where resistance varies with voltage.
Q3: What is the typical current range for household circuits?
A: Most household circuits are designed for 15-20 amps, though specific appliances may have different requirements.
Q4: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. For semiconductors, resistance typically decreases with temperature.
Q5: Can I calculate power using Ohm's Law?
A: Yes, power (P) can be calculated using variations: P = V×I, P = I²×R, or P = V²/R, combining Ohm's Law with the power formula.