Van de Graaff generators
E369717
Van de Graaff generators are electrostatic machines that use a moving belt to accumulate very high voltages on a hollow metal sphere, commonly used for physics research and educational demonstrations of electricity.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Van de Graaff generator | 1 |
| Van de Graaff generators canonical | 1 |
| tandem Van de Graaff accelerator | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3566577 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Van de Graaff generators Context triple: [John G. Trump, workedOn, Van de Graaff generators]
-
A.
Cockcroft–Walton generator
The Cockcroft–Walton generator is a high-voltage power supply circuit that uses a cascade of capacitors and diodes to multiply an input AC voltage, historically important for early particle acceleration experiments.
-
B.
Tesla coil
The Tesla coil is a high-voltage, high-frequency resonant transformer circuit invented by Nikola Tesla, famous for producing spectacular electrical discharges and demonstrating principles of wireless power transmission.
-
C.
Cockcroft–Walton experiment
The Cockcroft–Walton experiment was a pioneering 1932 nuclear physics experiment that achieved the first artificial disintegration of atomic nuclei using accelerated protons, confirming Einstein’s mass–energy equivalence.
-
D.
Maser
Maser is a small town in the Veneto region of northern Italy, noted for its Renaissance architecture and association with the architect Andrea Palladio.
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E.
Alexanderson alternator
The Alexanderson alternator is an early high-frequency radio transmitter that generated continuous-wave signals using a rotating machine, playing a key role in long-distance wireless communication before vacuum-tube oscillators.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Van de Graaff generators Target entity description: Van de Graaff generators are electrostatic machines that use a moving belt to accumulate very high voltages on a hollow metal sphere, commonly used for physics research and educational demonstrations of electricity.
-
A.
Cockcroft–Walton generator
The Cockcroft–Walton generator is a high-voltage power supply circuit that uses a cascade of capacitors and diodes to multiply an input AC voltage, historically important for early particle acceleration experiments.
-
B.
Tesla coil
The Tesla coil is a high-voltage, high-frequency resonant transformer circuit invented by Nikola Tesla, famous for producing spectacular electrical discharges and demonstrating principles of wireless power transmission.
-
C.
Cockcroft–Walton experiment
The Cockcroft–Walton experiment was a pioneering 1932 nuclear physics experiment that achieved the first artificial disintegration of atomic nuclei using accelerated protons, confirming Einstein’s mass–energy equivalence.
-
D.
Maser
Maser is a small town in the Veneto region of northern Italy, noted for its Renaissance architecture and association with the architect Andrea Palladio.
-
E.
Alexanderson alternator
The Alexanderson alternator is an early high-frequency radio transmitter that generated continuous-wave signals using a rotating machine, playing a key role in long-distance wireless communication before vacuum-tube oscillators.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
electrostatic generator
ⓘ
high-voltage device ⓘ physics demonstration apparatus ⓘ |
| beltMaterial | insulating material ⓘ |
| canBe |
single-ended
ⓘ
tandem ⓘ |
| category |
electrostatics equipment
ⓘ
high-voltage technology ⓘ |
| chargeType |
can accumulate negative charge
ⓘ
can accumulate positive charge ⓘ |
| commonUse |
electrostatic experiments
ⓘ
particle acceleration ⓘ physics education ⓘ public science demonstrations ⓘ research in nuclear physics ⓘ |
| developedBy | Robert J. Van de Graaff ⓘ |
| developmentDate | early 1930s ⓘ |
| effectOnPerson | can make hair stand on end ⓘ |
| fieldType | electrostatic field ⓘ |
| hasPart |
charge combs
ⓘ
hollow metal sphere ⓘ insulating belt ⓘ insulating column ⓘ lower pulley ⓘ motor-driven pulley ⓘ support structure ⓘ upper pulley ⓘ |
| maximumVoltage | several megavolts ⓘ |
| namedAfter | Robert J. Van de Graaff ⓘ |
| operatesOnPrinciple |
Faraday cage
ⓘ
surface form:
Faraday ice pail effect
charge transport by moving belt ⓘ electrostatic induction on a conductor ⓘ |
| powerSource | electric motor ⓘ |
| produces |
electric sparks
ⓘ
electrostatic field ⓘ high voltage ⓘ |
| requires |
dry air for best performance
ⓘ
good insulation ⓘ |
| safetyCharacteristic |
can still cause painful shocks
ⓘ
typically low current output ⓘ |
| sphereMaterial | metal ⓘ |
| typicalVoltageRange | hundreds of kilovolts ⓘ |
| usedIn |
early particle accelerators
ⓘ
ion beam generation ⓘ materials analysis ⓘ radiation research ⓘ |
| uses |
corona discharge
ⓘ
electrostatic induction ⓘ moving belt ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Van de Graaff generators Description of subject: Van de Graaff generators are electrostatic machines that use a moving belt to accumulate very high voltages on a hollow metal sphere, commonly used for physics research and educational demonstrations of electricity.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
tandem Van de Graaff accelerator
this entity surface form:
Van de Graaff generator