Public evidence

electrical.kw_to_va

Machine-checked verification for calculation version 1.3.1 · tier internally_reviewed

Open calculator API Capability Download JSON CVP Manifest MCP Review policy

CVP status

Sinusoidal PF; built-in ×/÷1000

Declared partition coverage: PASS · 3/3 declared partitions (kw-va, va-kw, invalid-domain)
Versions: Calculation 1.3.1 · CVP protocol 1.0.0-proposed · Evidence 2026-10-28.meta-metrics-v2
Verification revision: 2026-10-28.meta-metrics-v2 · 3/3 property · digest 60f4d43eb32a

Verification

Legacy regression suite: 14/14 calculation tests · Production surface contract 4/4

Three distinct suites: educational examples on the calculator page, this legacy regression count (14/14 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 1.3.1 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 1.3.1. CVP 1.0.0-proposed. 2/2 golden · 3/3 CVP boundary · 4/4 invalid · 3/3 property · 2/2 metamorphic · 1/1 cross-interface · 4/4 CVP contract. digest 60f4d43eb32a.

Golden (oracle-backed) 2 / 2
CVP boundary 3 / 3
Invalid input 4 / 4
Property 3 / 3
Metamorphic 2 / 2
Cross-interface 1 / 1
CVP contract 4 / 4
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 rejects incomplete input PASS
rest success payload validates schema PASS

Fingerprint sha256:f266ac0d36e60ba907e628204db60cef67fc8555232568453751b31bcdda0271

Input schema sha256:134a5597d6cd10eecd1dc00ed0790bb87e6851af2e415303d907a73e7dcef857 · Output schema sha256:2a177fd7dffe1815a8bbe0cf7277330f4cdb44a1a5864a58e003d7431d746a9f · 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: kw-to-va
Engine: kw-va
Engine build: 2026-09-18
Evidence core: 2026-09-18T23:59:21.988Z
Rendered: 2026-11-10T05:18:41.693Z
Last reviewed: 2026-08-08

Assumptions

PF relates real and apparent power for the AC load
1 kW = 1000 W

Limitations

PF ∈ (0,1] hard
Built-in kW↔VA scale ×1000

Sources

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

IEC 60050 — International Electrotechnical Vocabulary — Apparent power (IEV 131-11-41)
Supports: S (VA) is apparent power; distinct from active power P (kW); unit volt-ampere (VA)
IEC 60050 — International Electrotechnical Vocabulary — Power factor (IEV 131-11-46)
Supports: λ = |P| / S; S(VA) = 1000 × P(kW) / λ and P = S × λ / 1000
IEEE Std 1459-2025 — Real and apparent power conversion · 2025-05-16 · errata checked
Supports: S(VA) = 1000 × P(kW) / PF; P = S × PF / 1000
BIPM SI Brochure (9th edition, version 4.01) — SI units for watt and volt-ampere · 2026-06 · DOI
Supports: 1 kW = 1000 W scaling in VA conversion
NIST Guide to the SI (SP 811) — Watt and volt-ampere as power units
Supports: 1 kW = 1000 W scaling in VA conversion

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.