Public evidence

electrical.volts_to_kw

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· 1φ / 3φ; PF ∈ (0,1] · Protocol · Schema · Production report

Declared partition coverage: PASS · 3/3 declared partitions (v-kw, kw-v, invalid-domain)
Versions: Calculation 1.3.1 · CVP protocol 1.0.0-proposed
CVP identity: 1/1 property · digest a7eced588323

Verification

Legacy regression suite: 12/12 calculation tests · Production surface contract 2/2

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 1.3.1 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. 3/3 golden · 4/4 CVP boundary · 4/4 invalid · 1/1 property · 1/1 cross-interface · 1/1 CVP contract. digest a7eced588323.

Golden (oracle-backed) 3 / 3
CVP boundary 4 / 4
Invalid input 4 / 4
Property 1 / 1
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 sha256:46d20f463d78f11ad829119706429c19f5fb104b29bbe184c7c42f8ba0487675

Input schema sha256:44ca986561a6fb76f5701ef94ea3a32828c0dd2994593dc11f8b16c874e7ceb0 · Output schema sha256:2c8d5f92df8897df800d37d497e7cfe8676f093915530fa415205777ca40c2a3 · 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: volts-to-kw
Engine: volts-kw
Engine build: 2026-09-10
Evidence core: 2026-09-05T02:35:39.217Z
Rendered: 2026-09-16T22:03:43.708Z
Last reviewed: 2026-08-08

Assumptions

Balanced three-phase when √3 mode is selected
Voltage is RMS for AC
PF = 1 for DC / resistive

Limitations

PF ∈ (0,1] hard — FRACTION_OUT_OF_RANGE
V>0 on forward; I>0 on reverse

Sources

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

IEC 60050 — International Electrotechnical Vocabulary — Active power (IEV 131-11-42)
Supports: P is active power; unit watt (W). Under sinusoidal conditions P = Re S.
IEC 60050 — International Electrotechnical Vocabulary — Power factor (IEV 131-11-46)
Supports: λ = |P| / S; AC real-power formulas multiply V·I (and √3 for 3φ L-L) by λ
IEEE Std 1459-2025 — Real power from voltage, current, and power factor · 2025-05-16 · errata checked
Supports: 1φ P = PF·V·I/1000; 3φ L-L P = √3·PF·V·I/1000; DC P = V·I/1000
BIPM SI Brochure (9th edition, version 4.01) — SI units for ampere, volt, and watt · 2026-06 · DOI
Supports: DC P = V·I; kW = 1000 W unit scaling
NIST Guide to the SI (SP 811) — Volt, ampere, and watt
Supports: SI unit relationships in power calculations

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
`240V-10A`	golden	pass	Expected 2.4 · Actual 2.4
`120V-12A`	golden	pass	Expected 1.44 · Actual 1.44
`400V-20A-3phi`	golden	pass	Expected 12.471 · Actual 12.470765814495916
`kw-to-v`	golden	pass	Expected 240 · Actual 240
`soft-zero-I`	golden	pass	Expected 0 · Actual 0
`pf-zero`	boundary	pass	Expected FRACTION_OUT_OF_RANGE · Actual FRACTION_OUT_OF_RANGE
`zero-volts`	boundary	pass	Expected VOLTAGE_MUST_BE_POSITIVE · Actual VOLTAGE_MUST_BE_POSITIVE
`kw-v-zero-I`	boundary	pass	Expected VALUE_MUST_BE_POSITIVE · Actual VALUE_MUST_BE_POSITIVE
`roundtrip`	golden	pass	Expected 400 · Actual 400.00751150354574
`half-pf`	golden	pass	Expected 6.236 · Actual 6.235382907247958
`bad-phase`	boundary	pass	Expected INVALID_MODE · Actual INVALID_MODE
`property-volts-kw`	property	pass	2.4