{ "node": { "id": "term:ampere", "type": "Term", "label": "Ampere", "properties": { "id": "ampere", "name": "Ampere", "abbr": "A", "section": "topic-units", "definition": "The SI unit of electric current: one coulomb of charge passing a point per second. Cell currents are quoted in amperes, or as a C-rate so cells of different size can be compared.", "unit": "A", "related": [ "coulomb", "c-rate", "current" ], "url": "https://lemonergy.com/learn/glossary/ampere/", "mentions": [] } }, "edges": [ { "id": "edge:4", "source": "term:ampere", "target": "workflow:c-rate", "type": "usedIn", "properties": { "sourceFile": "wiki-blocks.json" } }, { "id": "edge:169", "source": "term:ampere", "target": "topic:topic-units", "type": "belongsTo", "properties": { "sourceFile": "terms.json" } }, { "id": "edge:170", "source": "term:ampere", "target": "term:coulomb", "type": "relatedTo", "properties": { "sourceFile": "terms.json", "meaning": "Related context; not a causal claim" } }, { "id": "edge:171", "source": "term:ampere", "target": "term:c-rate", "type": "relatedTo", "properties": { "sourceFile": "terms.json", "meaning": "Related context; not a causal claim" } }, { "id": "edge:172", "source": "term:ampere", "target": "term:current", "type": "relatedTo", "properties": { "sourceFile": "terms.json", "meaning": "Related context; not a causal claim" } }, { "id": "edge:173", "source": "term:ampere", "target": "visual:capacity", "type": "illustratedBy", "properties": { "sourceFile": "visual-pages.json" } }, { "id": "edge:174", "source": "term:ampere", "target": "reference:bipm-si", "type": "cites", "properties": { "sourceFile": "wiki-references.json", "scope": "direct technical reference" } } ], "neighbors": [ { "id": "workflow:c-rate", "type": "Workflow", "label": "Convert C-rate into current", "properties": { "id": "c-rate", "title": "Convert C-rate into current", "kind": "core", "summary": "Lemonergy Core evaluates this relation.", "steps": [ "Open the lesson and inspect the equation.", "Change one input while holding the others fixed." ], "example": "A 5 Ah cell at 0.5C corresponds to 2.5 A. At 2C it corresponds to 10 A.", "observe": "Compare the result with the equation and units.", "limits": "Current magnitudes do not establish safe charge rates.", "url": "https://lemonergy.com/learn/fundamentals/capacity-and-c-rate/", "label": "Open the worked lesson", "evidence": [ "src/battery_core/capacity.py" ] } }, { "id": "topic:topic-units", "type": "Topic", "label": "Units and electrical basics", "properties": { "id": "topic-units", "name": "Units and electrical basics", "lede": "The quantities every datasheet is written in, and how they relate.", "context": "Use consistent units and cell/pack basis.", "example": "10 A for 30 min transfers 5 Ah. At constant 3.6 V this is 18 Wh; varying voltage requires integration.", "lesson_url": "https://lemonergy.com/learn/fundamentals/capacity-and-c-rate/", "lesson_label": "Open capacity and C-rate" } }, { "id": "term:coulomb", "type": "Term", "label": "Coulomb", "properties": { "id": "coulomb", "name": "Coulomb", "abbr": "C", "section": "topic-units", "definition": "The SI unit of electric charge; one ampere flowing for one second. Battery engineers prefer the ampere-hour, which is 3600 coulombs, because cells deliver their charge over hours.", "unit": "C", "related": [ "ampere-hour", "faradays-constant" ], "url": "https://lemonergy.com/learn/glossary/coulomb/", "mentions": [ "ampere", "electric-charge" ] } }, { "id": "term:c-rate", "type": "Term", "label": "C-rate", "properties": { "id": "c-rate", "name": "C-rate", "section": "topic-ratings", "definition": "Current divided by nominal capacity, in reciprocal hours. 1C on a 20 Ah cell is 20 A; 2C is 40 A. C-rate lets you compare loads on cells of different sizes.", "formula": "C-rate = I / Q_nominal", "unit": "h⁻¹", "related": [ "nominal-capacity", "ideal-duration", "current", "e-rate", "fast-charging" ], "lesson": "fundamentals/capacity-and-c-rate/#c-rate", "example": { "title": "Convert a rating into amperes", "text": "For a 5 Ah cell, 0.5C means 2.5 A, 1C means 5 A and 2C means 10 A. Dividing 2.5 A by 5 Ah returns 0.5 h⁻¹, conventionally written 0.5C." }, "url": "https://lemonergy.com/learn/glossary/c-rate/", "mentions": [] } }, { "id": "term:current", "type": "Term", "label": "Current", "properties": { "id": "current", "name": "Current", "section": "topic-units", "definition": "The rate at which charge flows through the cell and its circuit, in amperes. Outside the cell it is carried by electrons; inside, by lithium ions moving through the electrolyte.", "formula": "I = dQ/dt", "unit": "A", "related": [ "ampere", "c-rate", "ionic-path" ], "lesson": "fundamentals/cell-anatomy/#discharge", "example": { "title": "Convert charge transfer to current", "text": "If 120 C passes a point in 60 s at a steady rate, the current is 2 A. When the rate varies, integrate the current trace to recover the total charge." }, "url": "https://lemonergy.com/learn/glossary/current/", "mentions": [ "electrolyte" ] } }, { "id": "visual:capacity", "type": "Visual", "label": "C-rate, current and duration", "properties": { "title": "C-rate, current and duration", "summary": "A C-rate becomes an actual current only when capacity is known.", "readout": "5 Ah × 1C = 5 A. Ideal duration: 1 h (60 min).", "formula": "I = Q × C-rate; t_ideal = 1 / C-rate", "note": "Voltage cutoff, losses, temperature and rate-dependent capacity are excluded.", "software": { "status": "implemented", "label": "Implemented in battery-core", "body": "current_from_c_rate calculates I = Q × C-rate; ideal_duration_hours calculates 1 / C-rate. Neither predicts voltage-cutoff time or real usable capacity.", "href": "../fundamentals/capacity-and-c-rate/" }, "html": "
Ideal remaining charge
Ideal remaining chargeTime (h) versus Remaining charge (Ah). 1C. Interpretation follows the graphs.001.2512.523.75354Time (h)Remaining charge (Ah)
1C
" } }, { "id": "reference:bipm-si", "type": "Reference", "label": "The International System of Units (SI), 9th edition", "properties": { "title": "The International System of Units (SI), 9th edition", "publisher": "Bureau International des Poids et Mesures", "url": "https://doi.org/10.59161/AUEZ1291", "type": "Metrology reference", "scope": "Definitions of SI units and coherent derived units; 2026 revision.", "year": 2026, "accessed": "2026-10-27" } } ] }