Public evidence

electrical.watts_amps

Machine-checked verification for calculation version 1.4.1 · tier engine_tested

Open calculator API Capability Download JSON CVP Manifest MCP Review policy

CVP status

DC / 1φ / 3φ LL

Declared partition coverage: PASS · 2/2 declared partitions (watts-amps, invalid-domain)
Versions: Calculation 1.4.1 · CVP protocol 1.0.0-proposed · Evidence 2026-10-28.meta-metrics-v2
Verification revision: 2026-10-28.meta-metrics-v2 · 8/8 property · digest df1ae92c4b04

Verification

Legacy regression suite: 24/24 calculation tests · Production surface contract 6/6

Three distinct suites: educational examples on the calculator page, this legacy regression count (24/24 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. Verification revision 2026-10-28.meta-metrics-v2. Calculation version 1.4.1. CVP 1.0.0-proposed. 1/1 golden · 4/4 CVP boundary · 2/2 invalid · 8/8 property · 2/2 metamorphic · 1/1 cross-interface · 6/6 CVP contract. digest df1ae92c4b04.

Golden (oracle-backed) 1 / 1
CVP boundary 4 / 4
Invalid input 2 / 2
Property 8 / 8
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 sha256:465de46099024f3f0720f1da017640210ce5a53c84a1b15ba9e7cd2c4b68f2d3

Input schema sha256:c81941dfc9e2bdc8d5f422b5af389c2e47a9e6c6420d547e1f8ea49b4bff2cdb · Output schema sha256:fbed785a3393b689760e84859b8c45ae7bdbc696a9f826b9c83e0684d3fd3958 · 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: watts-to-amps
Engine: watts-amps
Engine build: 2026-09-10
Evidence core: 2026-09-10T22:48:17.762Z
Rendered: 2026-11-10T05:18:41.664Z
Last reviewed: —

Assumptions

Balanced three-phase when 3φ (L-L) is selected.
Voltage and current are RMS for AC.
DC forces PF = 1; AC uses total power factor λ on real power.

Limitations

Not for unbalanced three-phase
Not for line-to-neutral three-phase as a separate mode
Not a substitute for breaker or conductor sizing

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 current I = P / (V·λ) (1φ) or I = P / (√3·V_L-L·λ) (3φ L-L)
IEEE Std 1459-2025 — Real power under sinusoidal and nonsinusoidal conditions · 2025-05-16 · errata checked
Supports: DC I = P/V; 1φ I = P/(V·PF); 3φ L-L I = P/(√3·V·PF)
BIPM SI Brochure (9th edition, version 4.01) — SI units for ampere, volt, and watt · 2026-06 · DOI
Supports: DC P = V·I so I = P/V; W and A unit relationships
NIST Guide to the SI (SP 811) — Watt and ampere as SI derived units
Supports: W as unit of power; A as unit of electric current

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.