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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.
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 for accurate calculation.
Q1: What are the units of measurement?
A: Current is measured in amperes (A), voltage in volts (V), 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 like semiconductors are non-ohmic.
Q3: What is the relationship between the three variables?
A: Current is directly proportional to voltage and inversely proportional to resistance. Double the voltage doubles the current; double the resistance halves the current.
Q4: Can I use this for AC circuits?
A: For AC circuits with purely resistive loads, Ohm's Law applies directly. For circuits with capacitive or inductive elements, impedance must be considered.
Q5: What are typical current values in household circuits?
A: Household circuits typically operate at 15-20 amps for standard outlets and lighting circuits, while larger appliances may require 30-50 amp circuits.