electric charge
Let an agent explain electric charge as a physical quantity, relay its units, constants and laws from SI and reference sources, distinguish it from current, voltage and related quantities, and support calculation and teaching.
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Concept What charge is.
Definition
Definition and properties.
Definition
Definition.
- What is electric charge, and what do conservation and quantisation mean? definition
- Is the question about charge, current, voltage or a chemical sense of charge? boundary
Units
Units and constants.
Units
Units.
- What are the unit and the elementary charge, and how are they defined in the SI? measurement
- Which reference gives the constants? provenance
Laws Laws and fields.
Coulomb
Coulomb law.
Coulomb
Coulomb.
- How does Coulomb law describe the force between charges, and how is the field defined? definition
- Which entry fits the electric field? action
Dynamics
Moving charge.
Dynamics
Dynamics.
- How does moving charge produce current and magnetic fields? definition
- Which entry fits electromagnetism? action
Measure Measuring charge.
Methods
Methods.
Methods
Methods.
- How is charge measured, from electrometers to integrating current? measurement
- What accuracy do methods give? measurement
Static
Electrostatics in practice.
Static
Static.
- How does static charge build up, and what precautions protect electronics and people? provenance
- Which entry fits electrostatic discharge? action
Learn Particles and teaching.
Particles
Charge of particles.
Particles
Particles.
- What charges do elementary particles carry, and why are fractional charges not observed freely? provenance
- Which entry fits particle physics? action
Teach
Teaching.
Teach
Teaching.
- How is charge taught, and which misconceptions arise? provenance
- Which references are standard? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Cross-cutting context
- Entry kind
- thing
- Plane
- XCT
- Domain
- XCT.QLT
- Other names and narrower kinds
- average total charge of produced positive ions, protein charge, formal charge, charge capacity, inductive charging, effective nuclear charge, AirPower
What it is Filled
The physical property of matter that causes it to experience a force in an electromagnetic field, existing in positive and negative kinds, conserved, quantised in units of the elementary charge carried by electrons and protons, and measured in coulombs; charge is the source of electric fields and, when moving, of electric current and magnetic fields.
Why it exists Filled
Let an agent explain electric charge as a physical quantity, relay its units, constants and laws from SI and reference sources, distinguish it from current, voltage and related quantities, and support calculation and teaching.
Distinguishing features Filled
- Two kinds, positive and negative
- Conserved in all known processes
- Quantised in units of e, with fractional charges of quarks confined
- Source of electromagnetic interaction
What robots and AI may and may not do Filled
Must not
- Encourage contact with charged equipment or circuits without safety measures.
- Confuse charge with current, voltage or energy in explanations.
- Use the language of charge to lend false scientific weight to health products.
Only with a human decision
- Working on high-voltage equipment or discharging stored charge.
May
- Explain electric charge, its conservation and quantisation, and the forces it causes.
- Measure and report charge in experiments and devices it is authorized to operate.
Moral aspects Filled
- Stored charge can injure or kill people working on equipment.
- Scientific terms are misused to sell pseudoscience.
Who is affected
- Students
- Electrical workers
- Consumers
Owners Filled
Steward
Nobody owns the property; it belongs to physics.
Links to other meta-models Filled
parent
- Q107715 - registry parent class
- Q117865208 - registry parent class
- Q181175 - registry parent class
- Q73792 - registry parent class
related
- physical quantity - a scalar quantity
- coulomb - the SI unit
- electric field - through Coulomb law
- electric current - the rate of flow of charge
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.electric-charge
- Wikidata: Q1111 (https://www.wikidata.org/wiki/Q1111)
- SI unit symbol: C coulomb
- quantity symbol: Q or q ISO 80000-6
Direct properties not applicable Not applicable
- elementary charge: 1.602176634 times 10 to the minus 19 C - exact by SI definition
- electron charge: minus one elementary charge e
- unit: coulomb C - ampere second
Plane XCT: no invented physical properties.
Recognition optional Filled
- Quantity measured in coulombs
- Positive and negative kinds that attract or repel
- Current is charge per time; voltage is energy per charge
- Not visible; observed through forces, sparks, attraction and instruments.
Capabilities and actions required Filled
- explain the property and its conservation and quantisation
- relay units and the elementary charge value
- apply Coulomb law and related relations
- distinguish charge from current, potential and capacitance
Hazards and failure modes required Filled
- Confusing charge with current or voltage
- Electrostatic discharge damaging electronics
- Sign errors in calculations
- Mixing chemical and physical senses of charge
Standards and interfaces required Filled
- SI Brochure from BIPM
- ISO 80000-6 electromagnetic quantities
- CODATA recommended values
Context of use required Filled
- Not for anything; a fundamental property of matter.
- positive and negative charge
- free and bound charge
- point, surface and volume charge distributions
- charge in chemistry: ionic, formal and partial charge
- charge on particles: electron, proton, quarks
Sources Filled
- Wikidata item Q1111: electric charge - identity and sense of the item
- Wikipedia: Electric charge - general description of the item
Open questions
- Should chemical charge concepts be separate entries?
- How should CODATA values be linked by release?
- The registry entry has merged aliases from protein charge to inductive charging; should they be split off?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q1111/spec.json