# jumper

> short length of conductor used to close, open or bypass part of an electronic circuit

**Wikidata**: [Q872157](https://www.wikidata.org/wiki/Q872157)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Jumper_(computing))  
**Source**: https://4ort.xyz/entity/jumper-q872157

## Summary
A jumper is a short length of conductor used to close, open, or bypass part of an electronic circuit. It typically consists of an electrical conductor encased in a plastic housing and is commonly used in personal computer hardware for configuration purposes.

## Key Facts
- Used primarily for adjustment within computer hardware systems.
- Consists of parts including an electrical conductor, plastic housing, two female electrical contacts, and occasionally a handle.
- Connects with components such as pin headers, motherboards, and Parallel ATA interfaces.
- Classified under both "personal computer hardware" and "electrical element."
- Often confused with but distinct from a jump wire.
- Featured in 23 language-specific Wikimedia sites, indicating broad documentation.
- Has visual representations available via Wikimedia Commons, including schematics and photographs.
- Referenced on Quora under the topic "Jumpers-1."

## FAQs
### Q: What is a jumper used for in computers?
A: A jumper is used to configure hardware settings on a motherboard or other PC components by opening or closing electrical connections. This can control functions like drive configurations or voltage levels.

### Q: How does a jumper differ from a jump wire?
A: While both involve conductors, a jumper usually includes a small housing and fixed contact points designed for specific placements like pin headers, whereas a jump wire is more flexible and often used manually during testing or prototyping.

### Q: Where are jumpers typically found inside a computer?
A: Jumpers are commonly located on motherboards, hard drives (especially older IDE/ATA models), and peripheral cards where they adjust operational parameters through physical connections.

## Why It Matters
Jumpers played a critical role in early digital electronics and computing by enabling manual configuration without software intervention. Before modern BIOS/UEFI interfaces became widespread, jumpers were essential for setting system parameters such as boot order, CPU frequency, or I/O voltages. Though less common today due to advancements in firmware-based controls, understanding jumpers remains relevant for diagnosing legacy hardware issues and working with embedded systems or custom electronics projects. Their design simplicity also makes them useful educational tools in demonstrating basic principles of circuits and connectivity.

## Notable For
- Being integral to configuring legacy personal computer hardware before plug-and-play standards emerged.
- Having standardized physical interfaces that allow precise placement across designated pins.
- Including dual female connectors specifically engineered to bridge adjacent terminals securely.
- Distinguishing itself clearly from generic wires or jump wires through structured form factor and intended usage.
- Supporting multiple languages and detailed technical documentation across global knowledgebases.

## Body

### Definition and Functionality
A jumper is defined as a short length of conductor used to close, open, or bypass part of an electronic circuit. Its primary function involves creating temporary or permanent electrical connections between two points on a circuit board—most notably in personal computer hardware for adjusting device behavior or configuration options.

### Physical Construction
The typical construction of a jumper includes:
- An internal **electrical conductor** which facilitates current flow.
- A protective outer **housing**, generally made of **plastic**, ensuring safe handling and insulation.
- Two **electrical contacts**, each compatible with **female connectors**, allowing secure attachment to corresponding pin headers.
- Occasionally, a **handle**, though this feature is noted as rare.

This modular design allows users to easily install or remove jumpers using minimal force while maintaining reliable electrical contact.

### Usage Context
Jumpers are predominantly utilized in **personal computer hardware**, particularly on:
- Motherboards
- Hard disk drives (especially IDE/PATA types)
- Expansion cards

They serve various roles, including selecting master/slave device status on parallel ATA channels, enabling/disabling onboard components, or modifying clock speeds and voltage settings.

### Relationship With Other Components
Jumpers interact directly with several key elements:
- **Pin Headers**: Standardized male-pin arrays onto which jumpers fit snugly.
- **Motherboards**: Host numerous jumper blocks for configuring chipset features.
- **Parallel ATA Interfaces**: Historically required jumpers to define drive roles (master/slave).

These interconnections highlight their importance in pre-configured hardware setups prior to widespread adoption of auto-sensing technologies.

### Distinction From Similar Concepts
While similar at first glance, jumpers must not be conflated with **jump wires**, which lack housings and are typically employed in breadboarding or ad hoc wiring scenarios rather than predefined PCB layouts. Additionally, unlike switches or dip switches, jumpers offer no moving parts; instead relying entirely on presence or absence to indicate state.

### Documentation and Representation
Extensive documentation exists around jumpers:
- Available imagery includes real-world examples and symbolic schematics.
- Foundational identifiers exist via Freebase (/m/01dks8) and Microsoft Academic Graph (ID: 2777280388).
- Represented in OmegaWiki's Defined Meaning database (entry ID: 1589566).
- Covered extensively on Wikipedia in ten languages including English, German, Spanish, and Bulgarian.

Such wide representation underscores the component’s historical and ongoing relevance in electronics education and practice.

## References

1. Freebase Data Dumps. 2013
2. Quora
3. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)