Ohm's Law

Ohm's Law is a fundamental concept in Physics and Electrical Engineering that describes the relationship between Voltage, Current, and Resistance in an Electrical Circuit. Named after the German physicist Georg Simon Ohm, who first formulated the law in 1827, Ohm's Law is a key principle in the field of Electronics and Electrical Engineering.

Definition

Ohm's Law states that the current passing through a conductor between two points is directly proportional to the voltage across the two points, and inversely proportional to the resistance between them. This is usually expressed in the formula: I = V/R, where:

• I is the current in amperes (A)
• V is the voltage in volts (V)
• R is the resistance in ohms (Ω)

Applications

Ohm's Law is used in many areas of electronics and electrical engineering, including:

• Designing Electrical Circuits
• Calculating the values of resistors in a circuit
• Determining the power consumption of an electrical device

Limitations

While Ohm's Law is a fundamental principle, it does not apply to all materials or conditions. For example, it does not accurately describe the behavior of semiconductors, which are used in many modern electronic devices.

See Also

• Kirchhoff's Circuit Laws
• Electrical Resistance and Conductance
• Electric Power

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