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អត្តសញ្ញាណប័ណ្ណសិក្សាអាស៊ីអាគ្នេយ៍ការរៀនសូត្រពេញមួយជីវិត • អធិបតេយ្យដោយការរចនាSEALSOUTH EAST ASIA LEARNING IDENTIFIERកម្ពុជា២០២៦
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Lesson 1.3 — What Electricity Does to You

Respect is built on understanding. Current, not voltage, is what kills — and it takes astonishingly little. One milliamp tingles. Ten milliamps locks your grip so you physically cannot let go. Fifty milliamps across the chest can stop your heart. A 400 V pack pushing through wet skin can drive hundreds of milliamps — instantly, silently and without a second chance. Add arc-flash (a 20 000 °C plasma ball if a tool shorts the bus), chemical burns from electrolyte, and thermal runaway — a damaged lithium cell heating its neighbours in an unstoppable chain reaction that no water extinguisher fully stops. Every rule in this course exists because of this lesson.

Effects of electric current on the human body Effect of AC current passing through the human body (approximate) 1 mAThreshold of perception — tingling 5–10 mAPainful shock, muscle reaction — involuntary movement causes secondary injury 10–20 mA“Let-go” threshold — muscles lock, victim cannot release the conductor 20–50 mARespiratory paralysis possible — breathing stops 50–100 mAVentricular fibrillation — usually fatal A 400 V pack driving current through dry skin (~1 000 Ω wet) can exceed 400 mA — far beyond fatal. This is why we verify ZERO volts, always.
THE ONE-HAND RULE: whenever practicable near HV, keep one hand in your pocket. Current that enters and exits the same hand hurts; current that crosses your chest from hand to hand stops your heart.

Key points

  • Remove ALL jewellery — a wedding ring across a 12 V busbar can weld and burn to the bone; across HV it is fatal
  • Lithium thermal runaway produces toxic HF gas — evacuate and call for a fire service response, do not play hero
  • An electric shock victim must not be touched directly — use the rescue hook, then CPR/AED once clear
  • Report EVERY shock, however small — internal injuries and heart arrhythmia can appear hours later
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SEAL — South East Asia Learning Identifier & Skills Portal · Prepared for MLVT Executive approval and TVET institute review · Derived from the Australian National Training Register (training.gov.au, CC-BY) and aligned to the Cambodian Qualifications Framework and DSC Standard Training Packages · Delivered via Gibble SMS · July 2026