ohmic

/'oumik/

Thân thiện

An electrician measures the ohmic resistance of a circuit.

Definition

1. Adjective:
   • Relating to or characterized by electrical resistance measured in ohms: Describes a property, component, or relationship that follows Ohm's law, where the current through a conductor is directly proportional to the voltage across it.
   • Pertaining to the ohm, the unit of electrical resistance: Concerning the measurement or quantity of resistance.

Usage Examples

• Adjective:
  • The resistor exhibits a perfectly linear, ohmic relationship between voltage and current.
  • We need to verify if the contact is ohmic or if it has a non-linear characteristic.
  • The device's behavior is ohmic at low voltages but becomes non-ohmic at higher levels.

Advanced Usage

• "ohmic contact": In electronics, a contact between a metal and a semiconductor where the voltage-current relationship is linear and the resistance is constant.
  • A good ohmic contact is essential for the reliable operation of this transistor.
• "ohmic heating": Also known as Joule heating, it is the process of heating a material by passing an electric current through it, relying on its ohmic resistance.
  • Ohmic heating is used in some modern food processing techniques.
• "ohmic loss": Power loss in an electrical system due to resistance in conductors and connections.
  • Engineers aim to minimize ohmic losses in power transmission lines.

Variants and Related Words

• Ohm (n): The SI unit of electrical resistance, symbol Ω.
  • A standard resistor might have a value of 1000 ohms.
• Non-ohmic (adj): Describing a material or component where the current is not directly proportional to the voltage (e.g., a diode).
  • A light-emitting diode (LED) is a classic example of a non-ohmic device.

Synonyms

• Resistive: Pertaining to or exhibiting electrical resistance.
• Linear (in a specific electrical context): Having a direct proportionality between voltage and current.

Related Phrases

• "Ohmic region": The range of operation for a device (like a transistor) where it behaves with a constant resistance.
  • The MOSFET operates in the ohmic region when used as a switch.
• "Ohmic value": The numerical measure of resistance in ohms.
  • Check the ohmic value of the resistor with a multimeter.

Học thuật

Adjective

1. of or relating to or measured in ohms