Public evidence

electrical.ev_voltage

Machine-checked verification for calculation version 1.3.0 · tier engine_tested

Open calculator API Capability Download JSON CVP Manifest MCP Review policy

CVP status

Charge is magnitude |Q|; electron (−e) vs proton (+e) sign is not modeled. Not a pure eV↔V unit conversion.

Declared partition coverage: PASS · 5/5 declared partitions (ev-v-e, ev-v-c, v-ev-e, v-ev-c, invalid-domain)
Versions: Calculation 1.3.0 · CVP protocol 1.0.0-proposed · Evidence 2026-09-14.si-exact-e-zero-charge
Verification revision: 2026-09-14.si-exact-e-zero-charge · 2/2 property · digest 99c55c4d8029

Verification

Legacy regression suite: 21/21 calculation tests · Production surface contract 5/5

Three distinct suites: educational examples on the calculator page, this legacy regression count (21/21 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 1.3.0 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 2026-09-14.si-exact-e-zero-charge. Calculation version 1.3.0. CVP 1.0.0-proposed. 6/6 golden · 8/8 CVP boundary · 11/11 invalid · 2/2 property · 3/3 metamorphic · 1/1 round-trip · 3/3 cross-interface · 3/3 CVP contract. digest 99c55c4d8029.

Golden (oracle-backed) 6 / 6
CVP boundary 8 / 8
Invalid input 11 / 11
Property 2 / 2
Metamorphic 3 / 3
Round-trip 1 / 1
Cross-interface 3 / 3
CVP contract 3 / 3
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
rest success payload validates schema PASS

Fingerprint sha256:d43cf367378ddf7038b44344ebeda43dc0a65cf781801267c537265520b4d063

Input schema sha256:372f3e8d25563732b3d1c97d63a4d5f012c97419053504fc14cd7a335e7f7d80 · Output schema sha256:3fb400eaf4fae09a6c405dd8ddfa34747286b5ca3615d9f4792e25aee4d3f58b · 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: ev-to-volts
Engine: ev-voltage
Engine build: 2026-09-21
Evidence core: 2026-09-21T09:47:31.791Z
Rendered: 2026-11-10T05:18:41.679Z
Last reviewed: —

Assumptions

Elementary charge e = 1.602176634×10⁻¹⁹ C exactly (SI defining constant; no uncertainty)
Uses the electrostatic energy–potential relation E = qV
Q(e) and Q(C) denote charge magnitude; sign and direction of the potential difference are not modeled

Limitations

Charge is magnitude only — electron (−e) vs proton (+e) sign is not modeled
Q = 0 when solving for voltage → ZERO_CHARGE (not 0 V)
Uses exact SI e = 1.602176634×10⁻¹⁹ C
Not a pure eV↔V unit conversion; ΔE = qΔV

Sources

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

BIPM SI Brochure, 9th edition — SI defining constants — elementary charge e = 1.602176634×10⁻¹⁹ C exactly
Supports: Exact SI elementary charge; coulomb-mode scale; 1 eV = e J
BIPM SI base unit — ampere — The ampere is defined by taking the fixed numerical value of the elementary charge e
Supports: e is an SI defining constant with no uncertainty
NIST Guide to the SI (SP 811) — Electronvolt as a non-SI energy unit accepted for use with SI
Supports: eV is energy; volts remain SI potential; eV ↔ J via e

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.