Public evidence

electrical.kva_to_kw

Machine-checked verification for calculation version 1.4.1 · 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 model; no distortion factor · Protocol · Schema · Production report

Declared partition coverage: PASS · 3/3 declared partitions (kva-kw, kw-kva, invalid-domain)
Versions: Calculation 1.4.1 · CVP protocol 1.0.0-proposed
CVP identity: 3/3 property · digest e00f9aa8ed23

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 1.4.1 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 1.4.1. 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 e00f9aa8ed23.

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:fc80799671a641d8ef33c7b8240aac362579fd9ce3ce1cf6eee18b5b8244340d

Input schema sha256:c543a92bf4e2fbc8d5bd563b71251aed29823ed93b26fe1c1427cfeae56cea92 · Output schema sha256:9919c77307a02ce1ce73fabc6190eacee2bb290c8bfe28b187406f53cc7750f8 · 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: kva-to-kw
Engine: kva-kw
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 is the displacement/true power factor relating P and S
Voltage and phase are not required when S or P is already known

Limitations

PF ∈ (0,1] hard
No voltage/phase required

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: kVA is apparent power S; unit volt-ampere (VA) at 10³ scale
IEC 60050 — International Electrotechnical Vocabulary — Power factor (IEV 131-11-46)
Supports: λ = |P| / S; P(kW) = S(kVA) × λ and S = P ÷ λ
IEEE Std 1459-2025 — Relationship P = S × PF for sinusoidal conditions · 2025-05-16 · errata checked
Supports: P(kW) = S(kVA) × PF; S = P ÷ PF
BIPM SI Brochure (9th edition, version 4.01) — SI units for watt and volt-ampere · 2026-06 · DOI
Supports: kW / kVA unit relationships; kilo (k) = 10³
NIST Guide to the SI (SP 811) — Kilowatt and related power units
Supports: kW / kVA unit relationships

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
`100kVA-0.8`	golden	pass	Expected 80 · Actual 80
`50kVA-0.9`	golden	pass	Expected 45 · Actual 45
`10kVA-0.85`	golden	pass	Expected 8.5 · Actual 8.5
`kw-to-kva-80`	golden	pass	Expected 100 · Actual 100
`unity`	golden	pass	Expected 25 · Actual 25
`soft-zero`	golden	pass	Expected 0 · Actual 0
`pf-zero`	boundary	pass	Expected FRACTION_OUT_OF_RANGE · Actual FRACTION_OUT_OF_RANGE
`pf-missing`	boundary	pass	Expected MISSING_REQUIRED_INPUT · Actual MISSING_REQUIRED_INPUT
`roundtrip`	golden	pass	Expected 50 · Actual 50
`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-kva-kw`	property	pass	100·0.8
`property-linear-pf`	property	pass	linear PF
`property-roundtrip`	property	pass	kw-kva recovers