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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 crucial for circuit design, component selection, safety analysis, and ensuring proper operation of electrical systems and devices.
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 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 all electrical circuits?
A: Ohm's Law applies to resistive circuits and components that follow linear relationships. It may not accurately describe circuits with non-linear components like diodes or transistors.
Q3: What is the relationship between power and Ohm's Law?
A: Power (P) can be calculated using P = V × I, and when combined with Ohm's Law, it can also be expressed as P = I² × R or P = V² / R.
Q4: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. This temperature dependence is described by the temperature coefficient of resistance.
Q5: What are some practical applications of Ohm's Law?
A: Ohm's Law is used in circuit design, troubleshooting electrical problems, calculating power consumption, selecting appropriate wire gauges, and designing safety systems.