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Ohm's Law:
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Ohm's Law is a fundamental principle in electrical engineering that defines the relationship between voltage (V), current (I), and resistance (R) 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 resistance is equal to the voltage divided by the current flowing through a circuit.
Details: Calculating resistance is crucial for designing electrical circuits, troubleshooting electrical problems, selecting appropriate components, and ensuring electrical safety in various applications.
Tips: Enter voltage in volts (V) and current in amperes (A). Both values must be positive numbers greater than zero for accurate calculation.
Q1: What are the units of measurement 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 all electrical components?
A: Ohm's Law applies to ohmic materials where resistance remains constant regardless of voltage or current. It doesn't apply to non-ohmic components like diodes and transistors.
Q3: What is the relationship between the three variables?
A: Voltage equals current times resistance (V = I × R), current equals voltage divided by resistance (I = V/R), and resistance equals voltage divided by current (R = V/I).
Q4: Why is resistance important in electrical circuits?
A: Resistance controls the flow of current, converts electrical energy to heat, and protects components from excessive current that could cause damage.
Q5: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. For semiconductors, resistance typically decreases with temperature.