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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 circuit overloads and ensures proper functioning 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: Can Ohm's Law be applied to AC circuits?
A: Ohm's Law applies to both DC circuits and AC circuits with resistive loads. For AC circuits with reactive components, impedance must be considered instead of pure resistance.
Q3: What is a typical current range for household circuits?
A: Most household circuits are designed for 15-20 amps, though specific appliances may have different current requirements.
Q4: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. This temperature dependence is not accounted for in the basic Ohm's Law calculation.
Q5: What are some practical applications of Ohm's Law?
A: Ohm's Law is used in circuit design, electrical safety calculations, fuse and breaker sizing, power supply design, and troubleshooting electrical problems.