emf
Definition
- Noun:
- Electromotive force: The rate at which energy is drawn from a source that produces a flow of electricity in a circuit; expressed in volts. It is the electrical potential generated by a source like a battery or generator, which drives current through a circuit.
Usage Examples
- Noun:
- The battery's emf is 1.5 volts.
- Measuring the emf of a cell requires a high-impedance voltmeter.
- The generator produces an emf by rotating a coil within a magnetic field.
Advanced Usage
"Induced emf": An electromotive force created by a changing magnetic field, as described by Faraday's law of induction.
- The induced emf in the coil caused a current to flow.
"Back emf": An electromotive force that opposes the change in current which created it, often seen in electric motors and inductors.
- The motor's back emf increases with its rotational speed.
Variants and Related Words
- EMF: The common abbreviation for electromotive force.
- Electromotive force: The full term for emf.
- Voltage (n): While often used interchangeably in casual contexts, voltage more precisely refers to the potential difference between two points, which can be caused by an emf or other factors.
- Potential difference (n): The difference in electric potential between two points.
Synonyms
- Electromotive force: The direct synonym.
- Driving potential: A descriptive term for the force that drives current.
Related Phrases and Concepts
"Source of emf": A device that provides electromotive force.
- A battery is a common source of emf.
"Internal resistance": The resistance within a source of emf that causes a drop in the terminal voltage when current flows.
- The battery's internal resistance reduces the available voltage under load.
Noun
-
the rate at which energy is drawn from a source that produces a flow of electricity in a circuit; expressed in volts
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