Public evidence

electrical.kwh_to_kw

Machine-checked verification for calculation version 1.2.1 · tier engine_tested

Open calculator API Capability Download JSON CVP Manifest MCP Review policy

CVP status

kW = kWh/h; kWh = kW·h

Declared partition coverage: PASS · 3/3 declared partitions (kwh-kw, kw-kwh, invalid-domain)
Versions: Calculation 1.2.1 · CVP protocol 1.0.0-proposed
CVP identity: 0/0 property · digest 365c3f53d267

Verification

Legacy regression suite: 12/12 calculation tests · Production surface contract 6/6

Three distinct suites: educational examples on the calculator page, this legacy regression count (12/12 golden + boundary), and the CVP verification suite below. They are not the same number. Property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the CVP Manifest . SKIP (0/0) means that suite has no published vectors.

This calculator CURRENT · Public schema 1.2.1 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓

CVP verification suite

Protocol checks from the Evidence Manifest. Distinct from the legacy regression suite above. Calculation version 1.2.1. CVP 1.0.0-proposed. 2/2 golden · 1/1 CVP boundary · 1/1 invalid · 1/1 cross-interface · 6/6 CVP contract. digest 365c3f53d267.

Golden (oracle-backed) 2 / 2
CVP boundary 1 / 1
Invalid input 1 / 1
Cross-interface 1 / 1
CVP contract 6 / 6
Interfaces PASS · UI (SSR) / REST / MCP
Interface claim ui-ssr is query-result HTML, not a live browser session.
Assurance Engineering

release artifacts aligned PASS
schema output required declared PASS
schema valid input executes PASS
engine success output validates schema PASS
schema rejects incomplete input PASS
rest success payload validates schema PASS

Fingerprint sha256:3b1f9a97a4bef7f3e3ad1a5777c672b019cda4e25024e652548b3f332ad8c5fe

Input schema sha256:15e94bdaeb369eb16884b7f23b5426fcda9615d3442831a89762b371f15a39ea · Output schema sha256:36d2af1e3c274cf69da1c84268972a401f587d80e51258da41112048624e1531 · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Build & scope

Engine identity and declared limitations.

Tool: kwh-to-kw
Engine: kwh-to-kw
Engine build: 2026-09-24
Evidence core: 2026-09-24T09:04:14.075Z
Rendered: 2026-09-24T09:22:02.325Z
Last reviewed: —

Assumptions

Power is the average over the stated period
Time is expressed in hours

Limitations

Average power over the interval — not instantaneous peak
Time must be in hours

Sources

Standards and references supporting this tool specification. Methods are listed separately — they are algorithms, not bibliographic sources.

Energy–power identity — E = P × t with coherent units (kWh, kW, h)
Supports: kW = kWh / h; kWh = kW × h
NIST Guide to the SI (SP 811) — Watt, joule, and watt-hour relationships
Supports: 1 kWh = 3.6 MJ; power as energy per time
IEC 60050 — International Electrotechnical Vocabulary — Active power (IEV 131-11-42)
Supports: P is active power; unit watt (W); kW is 10³ scale
IEC 60050 — International Electrotechnical Vocabulary — Watt hour (IEV 131-11-58)
Supports: 1 Wh ≔ 3600 J; kWh is the common multiple. P(kW) = E(kWh)/t(h) at constant power
BIPM SI Brochure (9th edition, version 4.01) — Watt, joule, and hour · 2026-06 · DOI
Supports: P = E/t; 1 kWh = 3.6 MJ

Legacy published checks

Golden and boundary cases from the legacy Evidence JSON. CVP property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the Manifest — including SKIP when a suite has no vectors.

ID	Kind	Status	Detail
`48-24`	golden	pass	Expected 2 · Actual 2
`100-10`	golden	pass	Expected 10 · Actual 10
`100-1`	golden	pass	Expected 100 · Actual 100
`kw-to-kwh`	golden	pass	Expected 7.5 · Actual 7.5
`1-5`	golden	pass	Expected 0.2 · Actual 0.2
`2kw-24h-reverse`	golden	pass	Expected 48 · Actual 48
`linear-2x-E`	golden	pass	Expected 4 · Actual 4
`inverse-half-t`	golden	pass	Expected 4 · Actual 4
`soft-zero-t`	golden	pass	Expected 0 · Actual 0
`soft-zero-E`	golden	pass	Expected 0 · Actual 0
`soft-zero-P-reverse`	golden	pass	Expected 0 · Actual 0
`soft-zero-t-reverse`	golden	pass	Expected 0 · Actual 0