ohm's law

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ohm's law

A student uses Ohm's law to calculate the current in a simple circuit.

Definition
  1. Noun:
    • A fundamental law of electrical circuits: Ohm's Law is a basic principle in physics and electrical engineering that describes the relationship between voltage, current, and resistance in an electrical conductor. It states that the electric 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.
Usage
  • General Statement: Ohm's Law is used to calculate one of the three fundamental electrical quantities (voltage, current, or resistance) when the other two are known.
  • Formula Representation: It is most commonly expressed by the formula I = V / R, where I is the current in amperes, V is the voltage in volts, and R is the resistance in ohms.
Examples
  • Noun:
    • To find the current in the circuit, we can apply Ohm's Law.
    • Understanding Ohm's Law is essential for anyone studying electronics.
    • The experiment was designed to verify Ohm's Law using a simple resistor.
Advanced Usage
  • "To obey Ohm's Law": Used to describe a component or material whose electrical behavior follows the linear relationship defined by Ohm's Law.
    • A standard resistor is said to obey Ohm's Law.
  • "Derived from Ohm's Law": Used to describe calculations or formulas that are based on the fundamental principle.
    • The power dissipated in the resistor was derived from Ohm's Law and the power formula.
Variants and Related Words
  • Ohmic (adj): Describing a material or component that obeys Ohm's Law.
    • The wire exhibits ohmic behavior over this voltage range.
  • Non-ohmic (adj): Describing a material or component (like a diode) that does not obey Ohm's Law.
    • An LED is a non-ohmic device.
Synonyms
  • Electrical law: A general term for a principle governing electrical phenomena.
  • Circuit law: A principle specifically related to electrical circuits.
Related Phrases
  • Ohm's Law triangle: A mnemonic tool used to remember the three forms of the equation (V=IR, I=V/R, R=V/I).
    • Use the Ohm's Law triangle to help rearrange the formula.
  • Ohm's Law calculator: A tool, often digital, for performing calculations based on the law.
    • I used an online Ohm's Law calculator to check my work.
ohm's law

A student uses Ohm's law to calculate the current in a simple circuit.

Noun
  1. electric current is directly proportional to voltage and inversely proportional to resistance; I = E/R

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