Series/Parallel Resistor Combiner

Inspectable records

Ledger state

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

Area

Electrical & Electronics Engineering

Tranche

tranche-2

Evidence ID

t2-006

Ledger rows

1

No ledger note is attached.

Review findings

The two stated formulas are standard for their respective simple topologies, but the spec is not complete enough to verify arbitrary series/parallel networks. The honest label is empty; it should state supported topology depth, accepted units, and handling of zero, empty, invalid, and non-finite resistor values.

Formula and scope findings

• Rs=ΣRi is correct for resistors connected strictly in series.
• 1/Rp=Σ1/Ri is correct for resistors connected strictly in parallel, provided every resistor value is nonzero and all values use the same resistance unit.
• The specification does not define how mixed or nested series/parallel topologies are represented or evaluated, so it does not fully specify computation of arbitrary series/parallel networks.
• The topology input is ambiguous: it does not state whether topology is limited to a single series or parallel group or can describe nested combinations.

Unit assumptions

• All resistor values in one calculation must use a common unit, such as all Ω or all kΩ; the resulting Req has that same unit.
• If values carry unit labels, the implementation must convert them to a common unit before applying the formulas.
• Resistor values are assumed to be real, positive values unless zero-ohm ideal shorts are explicitly supported.

Boundary hardening

BREAK_CLAIMED · SELF_FLAGGED

A zero-ohm resistor in a parallel network makes the reciprocal formula divide by zero, so the instrument must reject the input or implement an explicit ideal-short rule. Results also depend on an explicit resistance-unit convention.

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": {
    "resistors": [
      {
        "value": 100,
        "unit": "ohm"
      },
      {
        "value": 220,
        "unit": "ohm"
      },
      {
        "value": 330,
        "unit": "ohm"
      }
    ],
    "topology": "series"
  },
  "expected_outputs": {
    "Req": {
      "value": 650,
      "unit": "ohm"
    }
  },
  "working": "Rs = 100 Ω + 220 Ω + 330 Ω = 320 Ω + 330 Ω = 650 Ω."
}

Related workflows

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-tranche2/tranche2-results.json
• BOUNDARY_HAZARD_CATALOG.json