Public evidence

electrical.kwh_to_watts

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

W = 1000·kWh/h; kWh = W·h/1000

Declared partition coverage: PASS · 3/3 declared partitions (kwh-w, w-kwh, invalid-domain)
Versions: Calculation 1.2.1 · CVP protocol 1.0.0-proposed · Evidence 2026-10-28.meta-metrics-v2
Verification revision: 2026-10-28.meta-metrics-v2 · 0/0 property · digest abce7e2b8e6e

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. Verification revision 2026-10-28.meta-metrics-v2. Calculation version 1.2.1. CVP 1.0.0-proposed. 2/2 golden · 1/1 CVP boundary · 1/1 invalid · 2/2 metamorphic · 1/1 cross-interface · 6/6 CVP contract. digest abce7e2b8e6e.

Golden (oracle-backed) 2 / 2
CVP boundary 1 / 1
Invalid input 1 / 1
Metamorphic 2 / 2
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 sha256:2f1243deb47ae5d58324b74d1c5a729429371ccd16a27ccbd6e28b9b5b375e05

Input schema sha256:36e03de4cc6a5f64bdde21771eed9c9ef1588b32cd0bf841ea44730e408d23cb · Output schema sha256:ebe8b63eb3d9e96be3160fd6e10cb21f9aca1d8ca48e6fefe6f1a2c5f3f91e75 · 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-watts
Engine: scale-quotient
Engine build: 2026-09-15
Evidence core: 2026-09-15T06:31:46.555Z
Rendered: 2026-11-10T05:18:41.697Z
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
Shares the scale-quotient helper with W→kVA; contracts are distinct (time vs PF)

Sources

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

Energy–power identity — E = P × t; W = 1000 × kWh / h
Supports: P(W) = 1000·E(kWh)/t; E = P·t/1000
NIST Guide to the SI (SP 811) — Watt, joule, and watt-hour relationships
Supports: 1 kWh = 3.6 MJ; 1 kW = 1000 W scaling
IEC 60050 — International Electrotechnical Vocabulary — Active power (IEV 131-11-42)
Supports: P is active power; unit watt (W)
IEC 60050 — International Electrotechnical Vocabulary — Watt hour (IEV 131-11-58)
Supports: 1 Wh ≔ 3600 J; kWh is the common multiple for billing / energy meters
BIPM SI Brochure (9th edition, version 4.01) — Watt, joule, and hour · 2026-06 · DOI
Supports: P = E/t; 1 kW = 1000 W; 1 kWh = 3.6 MJ

Verification disclosure

Aggregate outcomes, scope and artifact commitments are public. Complete test inputs, expected values, execution records and oracle infrastructure are retained privately. This summary does not independently reproduce the full verification run.