Source: https://guthlabs.ai/docs/instruments/inductor-series-parallel-combiner/

instrument / verified-clean

# Inductor Series/Parallel Combiner

The current ledger marks this instrument verified clean within the source-bound verification corpus.

Status: **VERIFIED_CLEAN**Lifecycle: **verified-clean**

## Inspectable records

[01**Overview**Purpose and lifecycle](<https://guthlabs.ai/docs/instruments/inductor-series-parallel-combiner/>)[02**Mechanism**Method and assumptions](<https://guthlabs.ai/docs/instruments/inductor-series-parallel-combiner/mechanism/>)[03**Implementation**Binding and validation](<https://guthlabs.ai/docs/instruments/inductor-series-parallel-combiner/implementation/>)[04**Qualification**Evidence and errata](<https://guthlabs.ai/docs/instruments/inductor-series-parallel-combiner/qualification/>)

## Ledger state

The current ledger marks this instrument verified clean within the source-bound verification corpus.

**Area**: Electrical & Electronics Engineering — Circuits, Power Systems, Electronics Lab

**Tranche**: tranche-5

**Evidence ID**: t5-128

**Ledger rows**: 1

No ledger note is attached.

## Review findings

The stated series and parallel formulas are standard for ideal uncoupled inductors. The honest label correctly identifies the no-mutual-coupling assumption. Verdict is NEEDS_REVIEW because input units and mixed-unit behavior are unspecified, and valid-input constraints are not documented.

### Formula and scope findings

No additional record

### Unit assumptions

- All inductance values must use a common unit before applying either formula; the specification does not define an input-unit convention or mixed-unit handling.

- The formulas assume ideal, uncoupled inductors with linear, frequency-independent inductance values.

- For parallel combinations, each inductance must be nonzero; practical inductors also require compatible connection polarity and negligible parasitic effects.

## Boundary hardening

**BREAK_CLAIMED** · SELF_FLAGGED

A parallel input containing a zero-valued inductor causes division by zero and must be rejected. Additionally, the input specification does not define a unit convention, so bare values can produce results differing by a factor of 1000 between mH and H.

## Errata and corrections

No applied erratum is attached to this unique-name record.

## Inspectable example

4 review vectors are recorded. One source-bound sample is shown below.

````
{
  "inputs": {
    "topology": "series",
    "inductors": [
      {
        "value": 10,
        "unit": "uH"
      },
      {
        "value": 22,
        "unit": "uH"
      },
      {
        "value": 47,
        "unit": "uH"
      }
    ]
  },
  "expected_outputs": {
    "Leq": 79,
    "unit": "uH"
  },
  "working": "Ls = ΣLi = 10 uH + 22 uH + 47 uH = 32 uH + 47 uH = 79 uH."
}
````

## Related workflows

No source-defined multi-instrument workflow membership is recorded.

## Sources and evidence

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

- `VERIFIED_LEDGER.json · VERIFIED_CLEAN`

- `evidence-tranche5/tranche5-results.json`

- `BOUNDARY_HAZARD_CATALOG.json`