curl --request POST \
  --url https://api.iotools.cloud/v1/tool/rc-circuit-time-constant-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "resistance": "1",
  "resistanceUnit": "kohm",
  "capacitance": "1000",
  "capacitanceUnit": "uf"
}
'

{
  "tool": "rc-circuit-time-constant-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "tau": "1 s",
    "tauTable": [
      {
        "multiple": "1τ",
        "time": "1 s",
        "charging": "63.2%",
        "discharging": "36.8%"
      },
      {
        "multiple": "2τ",
        "time": "2 s",
        "charging": "86.5%",
        "discharging": "13.5%"
      },
      {
        "multiple": "3τ",
        "time": "3 s",
        "charging": "95.0%",
        "discharging": "5.0%"
      },
      {
        "multiple": "4τ",
        "time": "4 s",
        "charging": "98.2%",
        "discharging": "1.8%"
      },
      {
        "multiple": "5τ",
        "time": "5 s",
        "charging": "99.3%",
        "discharging": "0.7%"
      }
    ],
    "summary": "τ = R × C\nR = 1 kΩ\nC = 1000 µF\nτ = 1 s\nA circuit is considered essentially fully charged/discharged after about 5τ ≈ 5 s (99.3%)."
  },
  "credits_used": 3,
  "credits_remaining": null
}