---
search:
boost: 5.0
---
# Slot: system_charge
_Total electrostatic charge of the system given by the elementary charge (e)._
URI: [https://CCPBioSim.ac.uk/biosim-schema/system_charge](https://CCPBioSim.ac.uk/biosim-schema/system_charge)
## Applicable Classes
| Name | Description | Modifies Slot |
| --- | --- | --- |
| [Particles](../classes/Particles.md) | Particle information included in the topology | no |
## Properties
### Type and Range
| Property | Value |
| --- | --- |
| Range | [ChargeQuantity](../classes/ChargeQuantity.md) |
| Domain Of | [Particles](../classes/Particles.md) |
### Cardinality and Requirements
| Property | Value |
| --- | --- |
### Value Constraints
| Property | Value |
| --- | --- |
| Regex Pattern | `^[+-]?\d+(\.\d+)?$` |
## Identifier and Mapping Information
### Annotations
| property | value |
| --- | --- |
| engine_mapping | [{'engine': 'toptrajparser', 'key': 'system_charge', 'unit': 'e'}] |
### Schema Source
* from schema: https://CCPBioSim.ac.uk/biosim-schema/
## Mappings
| Mapping Type | Mapped Value |
| --- | --- |
| self | https://CCPBioSim.ac.uk/biosim-schema/system_charge |
| native | https://CCPBioSim.ac.uk/biosim-schema/system_charge |
## LinkML Source
```yaml
name: system_charge
annotations:
engine_mapping:
tag: engine_mapping
value:
- engine: toptrajparser
key: system_charge
unit: e
description: Total electrostatic charge of the system given by the elementary charge
(e).
from_schema: https://CCPBioSim.ac.uk/biosim-schema/
rank: 1000
domain_of:
- Particles
range: ChargeQuantity
pattern: ^[+-]?\d+(\.\d+)?$
```