Verified calculation capability

Volts to Joules Calculation Capability

Relate voltage and charge to energy: E = V × Q (1 V = 1 J/C). Reverse: V = E ÷ Q. · Electrical

Capability ID electrical.volts_to_joules · version 1.2.0

Open calculator REST API MCP Evidence Evidence JSON Review policy

Model

Volts → joules

Volts → joules: E(J) = V(V) × Q(C)
Joules → volts: V(V) = E(J) ÷ Q(C)
Volts → joules (elementary): E(J) = V × Q(e) × 1.602176565×10⁻¹⁹
Joules → volts (elementary): V = E ÷ (Q(e) × 1.602176565×10⁻¹⁹)

Inputs / Outputs

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

Symbol	Quantity	Unit	Role
`a`	Voltage in V (V→J) or energy in J (J→V)	—	input
`b`	Charge in C. Must be ≠ 0 on reverse.	—	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

Electrostatic potential energy relation; Q is the charge moved through V

Example

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

12 V × 5 C = 60 J

Open this example in the calculator

Trust

Review-policy: engine tested — automated tests, sources, version lock, and evidence published. Supplemental to CVP; not Domain Expert Review. See CVP and Review policy.

Tier: Engine tested — catalog token engine_tested
Calculation version: 1.2.0
Evidence tests: 12/12 calculation tests · golden 12/12 · boundary 0/0 · property 0/0
Engine tested: Yes
Source checked: Yes
Supplemental domain review: Not performed
Named expert review: Not performed
Version lock: Supported (409 VERSION_MISMATCH)
Artifact consistency: Build verified · 1.2.0 (workspace artifacts agree)

Production attestation: Embedded snapshot: STALE · Last attested schema matched 1.2.0 snapshot / local build · Semantic contract ✓ · Last attestation PASS · current evidence changed · re-attestation required · Public/cache ✓ · Origin ✓ · Live production status PASS (0 stale; 164 CURRENT) @ 2026-09-16T06:44:24.909Z
Semantic contract: PASS
Evidence attested at: 2026-09-16T06:44:24.203Z
Last production check: 2026-09-16T06:44:24.203Z
Public / cache: PASS
Origin: PASS

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: volts-to-joules
Engine: product
REST: POST /api/v1/calc/volts-to-joules
MCP: execute_calculation with capability_id: "electrical.volts_to_joules"
Agent input schema: Canonical (MCP / Agent)
Output schema: JSON Schema (latest)
Versioned input schema: Immutable pin (1.2.0)
Versioned output schema: Immutable pin (1.2.0)

Operations

Declared calculation modes for this capability.

v-j
j-v

References

Human-readable sources plus CVP reference evidence classes.

Sources

SI definition of the volt — 1 V = 1 J/C (energy per unit charge)
NIST Guide to the SI (SP 811) — Joule, volt, coulomb relationships
CODATA elementary charge — e ≈ 1.602176565×10⁻¹⁹ C (page constant)

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.volts_to_joules"}}}'

Inspect the trust tier and required assurance level before execution. Pin calculation_version (1.2.0) when reproducibility matters. Full protocol notes: MCP docs.