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: CVP VERIFIED · CVP protocol 1.0.0-proposed · Engineering assurance· DC / 1φ / 3φ LL · Protocol · Schema · Production report

Declared partition coverage: PASS · 2/2 declared partitions (watts-amps, invalid-domain)
Versions: Calculation 1.4.1 · CVP protocol 1.0.0-proposed
CVP identity: 8/8 property · digest 8b431c133176

Verification

Legacy regression suite: 24/24 calculation tests · Production surface contract 4/4

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. Calculation version 1.4.1. CVP 1.0.0-proposed. 1/1 golden · 4/4 CVP boundary · 2/2 invalid · 8/8 property · 1/1 cross-interface · 1/1 CVP contract. digest 8b431c133176.

Golden (oracle-backed) 1 / 1
CVP boundary 4 / 4
Invalid input 2 / 2
Property 8 / 8
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 valid input executes PASS
engine success output validates schema PASS
schema rejects incomplete input 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: 2026-09-16T22:03:43.699Z
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

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
`dc-1000W-120V`	golden	pass	Expected 8.333 · Actual 8.333333333333334
`dc-2400W-240V`	golden	pass	Expected 10 · Actual 10
`1phi-2000W`	golden	pass	Expected 22.727 · Actual 22.727272727272727
`3phi-10000W`	golden	pass	Expected 16.04 · Actual 16.037507477489605
`dc-60W-12V`	golden	pass	Expected 5 · Actual 5
`dc-amps-to-watts`	golden	pass	Expected 1500 · Actual 1500
`1phi-2000W-230V`	golden	pass	Expected 10.87 · Actual 10.869565217391305
`dc-linear-2x-power`	golden	pass	Expected 16.667 · Actual 16.666666666666668
`soft-zero-volts`	golden	pass	Expected 0 · Actual 0
`soft-zero-power`	golden	pass	Expected 0 · Actual 0
`soft-pf-zero-as-one`	golden	pass	Expected 18.182 · Actual 18.181818181818183
`3phi-roundtrip-a-w`	golden	pass	Expected 10000 · Actual 10001.554183225724
`boundary-pf-zero-as-one`	boundary	pass	Expected 18.181818181818183 · Actual 18.181818181818183
`boundary-zero-volts-ac`	boundary	pass	Expected 0 · Actual 0
`boundary-missing-volts`	boundary	pass	Expected MISSING_REQUIRED_INPUT · Actual MISSING_REQUIRED_INPUT
`boundary-neg-volts`	boundary	pass	Expected VOLTAGE_MUST_BE_POSITIVE · Actual VOLTAGE_MUST_BE_POSITIVE
`property-dc-w-a`	property	pass	DC: I = P/V
`property-dc-a-w`	property	pass	DC: P = I·V
`property-dc-roundtrip`	property	pass	DC W↔A round-trip
`property-1phi-pf`	property	pass	1φ: I = P/(V·λ)
`property-linear-power`	property	pass	I(2P)=2I(P) at fixed V
`property-3phi-pf`	property	pass	3φ: I = P/(√3·V·λ)
`property-3phi-roundtrip`	property	pass	3φ W↔A round-trip
`property-inverse-v`	property	pass	I(2V)=I/2 at fixed P