Verified calculation capability

Energy consumption Calculation Capability

Convert watts and hours to kilowatt-hours. · Electrical

Capability ID electrical.energy_consumption · version 1.4.2

Open calculator REST API MCP Evidence Evidence JSON CVP Manifest Review policy

Model

Energy

Energy: E(kWh) = P(W) × t(h) ÷ 1000
Daily: E(kWh/day) = P(W) × t(h/day) ÷ 1000
Month / year: ≈ E/day × 30 · E/day × 365
Power ↔ energy: P(kW) = E(kWh) ÷ t(h) · P(W) = 1000 × E(kWh) ÷ t(h)

Inputs / Outputs

Canonical symbols for this capability. Agent schemas remain the contract.

Symbol	Quantity	Unit	Role
`W`	Average power (W). Must be ≥ 0.	—	input
`hours`	Duration (h). Must be ≥ 0.	—	input
`formula`	—	—	output
`api_version`	—	—	output
`api_contract_version`	—	—	output
`spec_version`	—	—	output
`page`	Canonical calculator page URL	—	output
`links`	—	—	output

Assumptions / Validity

Declared scope for this capability. Do not use it outside this domain.

Assumptions

Constant power over the stated hours.
Month = 30 days, year = 365 days in daily UI projections (presentation-only).
User converts kW→W when needed.
W ≥ 0 and hours ≥ 0 (consumption, not signed energy flow).

Not supported

Efficiency
standby cycles
TOU costing (use Energy Cost / Electricity Bill)

Example

One numerical check. The calculator page holds worked steps and FAQ.

1500 W × 3 h = 4.5 kWh

Open this example in the calculator

Trust

CVP VERIFIED · CVP protocol 1.0.0-proposed · Engineering assurance · core energy calculation (W × h / 1000 → kWh). Computational verification is defined by CVP. Supplemental domain review (internal) and named expert review are defined by the Review policy and do not by themselves determine CVP conformance.

CVP: CVP VERIFIED · CVP protocol 1.0.0-proposed · Engineering assurance · core energy calculation (W × h / 1000 → kWh)· View Manifest · CVP overview · Specification
Verified scope: core energy calculation (W × h / 1000 → kWh)
Assurance: Engineering
Declared partition coverage: PASS · 3/3 declared partitions (nominal-positive, zero, invalid-domain)
Deferred: UI daily/month/year projections (×30 / ×365)
Calculation version: 1.4.2
Verification: 16/16 calculation tests · 9/9 legacy golden · 3/3 legacy boundary · 4/4 legacy property
Production surface contract: 4/4
Versions: Calculation 1.4.2 · CVP protocol 1.0.0-proposed · Evidence 2026-09-13.negative-input-contract
Verification revision: 2026-09-13.negative-input-contract · 4/4 property · digest 9f36849cd3cd
Reference: O1 model · O2 expected_values · O2 numerical_behavior
Interfaces: PASS · UI (SSR) / REST / MCP
ui-ssr is query-result HTML, not a live browser session.
CVP suite: 2/2 golden · 3/3 CVP boundary · 5/5 invalid · 4/4 property · 2/2 cross-interface · 4/4 CVP contract
Supplemental domain review: Internal · Pass · electrical-engineer
Named expert review: Not performed
Version lock: Supported (409 VERSION_MISMATCH)
Artifact consistency: Build verified · 1.4.2 (workspace artifacts agree)
Review-policy tier: Internally reviewed — catalog token internally_reviewed; supplemental; not CVP status

This calculator CURRENT · Public schema 1.4.2 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓

Call this capability

Human page, REST, and MCP share the same engine and calculation_version. Build verified hashes workspace artifacts only. After deploy, attest:production GETs canonical URLs twice — the public/cached view an Agent actually hits, and origin — including every /capabilities/{id} HTML page. Public Capability HTML version must match catalog before production attestation passes. Live Trust rows above fetch /.well-known/calculatorx-production-attestation.json and the output schema const. Build hashes: release integrity. That proves currently published page / engine / schema / evidence / MCP agree — not that a historical version is independently immutable. Reference Calculation Standard — Production surface contract 4/4.

Tool id: energy-consumption
Engine: energy
REST: POST /api/v1/calc/energy-consumption
MCP: execute_calculation with capability_id: "electrical.energy_consumption"
Agent input schema: Canonical (MCP / Agent)
Output schema: JSON Schema (latest)
Versioned input schema: Immutable pin (1.4.2)
Versioned output schema: Immutable pin (1.4.2)

References

Human-readable sources plus CVP reference evidence classes.

Sources

Reference evidence classes: O1 model · O2 expected_values · O2 numerical_behavior

Try with an agent

Inspect this capability via same-origin MCP, then call execute_calculation.

curl -sS -X POST 'https://www.calculatorx.com/mcp' \
  -H 'Content-Type: application/json' \
  -H 'MCP-Protocol-Version: 2026-07-28' \
  -H 'Mcp-Method: tools/call' \
  -H 'Mcp-Name: inspect_capability' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"inspect_capability","arguments":{"capability_id":"electrical.energy_consumption"}}}'

Inspect the trust tier and required assurance level before execution. Pin calculation_version (1.4.2) when reproducibility matters. Full protocol notes: MCP docs.