Public evidence

electrical.kw_to_va

Machine-checked verification for calculation version 1.3.1 · tier expert_verified

Open calculator API Capability Download JSON CVP Manifest MCP Review policy

CVP: CVP VERIFIED · CVP protocol 1.0.0-proposed · Engineering assurance· Sinusoidal PF; built-in ×/÷1000 · Protocol · Schema · Production report

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
CVP identity: 3/3 property · digest d259cd255328

Verification

Legacy regression suite: 14/14 calculation tests · Production surface contract 2/2

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. Calculation version 1.3.1. CVP 1.0.0-proposed. 2/2 golden · 4/4 CVP boundary · 4/4 invalid · 3/3 property · 1/1 cross-interface · 1/1 CVP contract. digest d259cd255328.

Golden (oracle-backed) 2 / 2
CVP boundary 4 / 4
Invalid input 4 / 4
Property 3 / 3
Cross-interface 1 / 1
CVP contract 1 / 1
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 rejects incomplete input 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: 2026-09-10
Evidence core: 2026-09-05T02:35:39.217Z
Rendered: 2026-09-16T22:03:43.706Z
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

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
`5kW-0.8`	golden	pass	Expected 6250 · Actual 6250
`1kW-0.8`	golden	pass	Expected 1250 · Actual 1250
`10kW-0.8`	golden	pass	Expected 12500 · Actual 12500
`1kW-1`	golden	pass	Expected 1000 · Actual 1000
`va-kw`	golden	pass	Expected 5 · Actual 5
`pf-zero`	boundary	pass	Expected FRACTION_OUT_OF_RANGE · Actual FRACTION_OUT_OF_RANGE
`soft-zero`	golden	pass	Expected 0 · Actual 0
`roundtrip`	golden	pass	Expected 1 · Actual 1
`pf-missing`	boundary	pass	Expected MISSING_REQUIRED_INPUT · Actual MISSING_REQUIRED_INPUT
`neg`	boundary	pass	Expected VALUE_MUST_BE_NON_NEGATIVE · Actual VALUE_MUST_BE_NON_NEGATIVE
`bad-mode`	boundary	pass	Expected INVALID_MODE · Actual INVALID_MODE
`property-kw-va`	property	pass	5kW/0.8
`property-linear-P`	property	pass	2P
`property-roundtrip`	property	pass	va-kw recovers