Examples
Examples
Try the starting example
- Load tests: ID, resting V, loaded V, measured load A, supplied condition label
- A,12.6,10.6,200,Cold B,12.6,11.1,150,Cold C,12.6,11.4,200,Warm
- Observed resting-minus-loaded voltage by test (V)
- A: 2; B: 1.5; C: 1.2
- Apparent test-path resistance by test (milliohm)
- A: 10; B: 10; C: 6
- Through-origin voltage-drop/current fitted resistance by condition (milliohm)
- Cold: 10; Warm: 6
Try another scenario
- Load tests: ID, resting V, loaded V, measured load A, supplied condition label
- A,12.6,10.6,200,Cold B,12.6,10.8,150,Cold C,12.6,11.4,200,Warm
- Observed resting-minus-loaded voltage by test (V)
- A: 2; B: 1.8; C: 1.2
- Apparent test-path resistance by test (milliohm)
- A: 10; B: 12; C: 6
- Through-origin voltage-drop/current fitted resistance by condition (milliohm)
- Cold: 10.72; Warm: 6
Calculation method
Calculation method
Observed resting-minus-loaded voltage by test (V)
Resting−loaded voltage, preserving negative changes.
Apparent test-path resistance by test (milliohm)
1000×observed voltage drop/measured current.
Through-origin voltage-drop/current fitted resistance by condition (milliohm)
Within each supplied condition compute 1000×sum(I×drop)/sum(I²), without combining different condition labels.
Symbols and units
- a
- Load tests: ID, resting V, loaded V, measured load A, supplied condition label
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Calculation steps and notation
sum(list) adds all entries in the list.
Assumptions & limits
Assumptions & limits
- An apparent voltage-drop/current observation model, not a battery internal-resistance certification, cranking diagnosis, capacity test or temperature correction. Wiring and measurement effects remain included in the supplied path readings.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.
Further reading
OpenStax: ratios, unit rates and supplied measurement arithmetic ↗
Background reading; this does not imply endorsement or independent review of SumFizz.