Source: https://guthlabs.ai/docs/instruments/ac-power-triangle-calculator/implementation/

instrument implementation / implementation-contract

# AC Power Triangle Calculator implementation

A source-bound implementation contract for AC Power Triangle Calculator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t4-018

**Effect**: Computation or source lookup only

## Input and validation requirements

The zero-voltage input produces S=0 and makes PF=P/S equal to 0/0, so the calculator must reject the input or report power factor as undefined rather than returning a numeric value.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "V": 120,
    "V_unit": "V",
    "I": 10,
    "I_unit": "A",
    "phase_angle": 30,
    "phase_angle_unit": "degrees"
  },
  "expected_outputs": {
    "P_W": 1039.2305,
    "Q_var": 600,
    "S_VA": 1200,
    "PF": 0.8660254
  },
  "working": "S = V I = 120 x 10 = 1200 VA. P = V I cos(theta) = 120 x 10 x cos(30 degrees) = 1200 x 0.8660254 = 1039.2305 W. Q = V I sin(theta) = 1200 x 0.5 = 600 var. PF = P/S = 1039.2305/1200 = 0.8660254."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/ac-power-triangle-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/ac-power-triangle-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/ac-power-triangle-calculator/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche4/tranche4-results.json`