resistor
Let an agent identify resistor types and read their markings, explain how resistors are chosen and used in circuits, relay standards and ratings, and distinguish fixed resistors from variable, sensing and special forms.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent identify resistor types and read their markings, explain how resistors are chosen and used in circuits, relay standards and ratings, and distinguish fixed resistors from variable, sensing and special forms.
A passive electronic component that opposes the flow of electric current with a defined resistance, used to set currents and voltages, divide voltages, terminate lines, dissipate power and sense temperature or light; resistors are made as carbon, metal film, wirewound, thick film and other types, rated by resistance, tolerance and power, and marked by colour bands or codes.
What it is for: Controlling current and voltage in circuits.
It can be identify types and read markings; explain selection by resistance, tolerance and power; relay standards and series; distinguish related components.
Distinguishing features
Defined resistance
Passive two-terminal device
Types by material and construction
Standard value series
What it looks like
A small cylindrical or rectangular component with two leads or terminals, often with colour bands, or a tiny chip on a circuit board.
Physical character
common values: 1 ohm to 10 megohm range - E-series
power ratings: 0.05-100 W - typical, higher for power types
How it is recognised
Two-terminal component with defined resistance
Colour bands or printed codes
Thermistors, photoresistors and potentiometers are variable or sensing forms
Related models
is a kind of - the category
obeys - ideally
is used in - a basic circuit
is related to - a temperature-dependent form
In practice
Families and kinds
carbon composition and carbon film
metal film and metal oxide
wirewound and power resistors
thick and thin film chip resistors
variable resistors and potentiometers
sensing resistors: thermistors, resistance thermometers, photoresistors
special forms: zero-ohm links, bleeder resistors, liquid resistors
Identifiers
IEC 60062 marking codes colour and letter codes
E-series IEC 60063 preferred values
Standards and regulation
IEC 60062 marking codes and IEC 60063 preferred values
IEC 60115 fixed resistor specifications
RoHS restrictions on materials
Failure modes and hazards
Overheating and burnout above rated power
Drift with temperature and age
Misreading markings
Open circuit failure
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.resistor
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Identify What resistor this is.
Identity.
Type
Type and markings.
Type
Type.
- What type is the resistor, and how are its markings read? definition
- Is the component a fixed resistor, a variable one or a sensing device? boundary
Ratings
Ratings.
Ratings
Ratings.
- What do resistance, tolerance, power and temperature coefficient ratings mean? definition
- Which entry fits the specific sensing device? action
Use Circuit use.
Application.
Circuits
Circuit functions.
Circuits
Circuits.
- How are resistors used to set currents, divide voltages, bleed charge and terminate lines? provenance
- Which entry fits the specific circuit? action
Select
Selection.
Select
Select.
- How is a resistor value and type chosen for a given circuit? action
- What value and rating follow for the case in question? measurement
Standards Standards and manufacture.
Standards.
Series
Preferred values.
Series
Series.
- What are the E-series preferred values and marking codes? provenance
- Which references are standard? provenance
Manufacture
Manufacture.
Manufacture
Manufacture.
- How are resistors of different types made? provenance
- Which entry fits electronic manufacturing? action
Context History and teaching.
Context.
History
History.
History
History.
- How did resistors develop from early wire coils to chip resistors? provenance
- Which entry fits the history of electronics? action
Teach
Teaching.
Teach
Teaching.
- How are resistors taught, and which misconceptions arise? provenance
- Which entry fits electronics education? action
What the second pass must settle
- Should sensing resistors be separate entries?
- How should standards be linked?
- The registry entry has merged aliases naming sensing devices and special forms; should they be split off?