Advanced Technology Applications and Safety
Core concepts
Understand emerging and advanced applications: IoT devices, embedded sensing, robotics, automation, renewable energy integration, and basic principles of electric vehicles and battery management. Candidates should know electrical safety fundamentals-shock hazards, isolation, earthing, residual current devices, lockout/tagout, and safe working practices with capacitors and high voltage. Understand EMC and EMI, shielding, grounding, and the importance of standards compliance. Know the risks of lithium batteries, arc flash, and stored energy. Familiarity with environmental and disposal regulations, and with documentation and risk assessment, is expected.
Traps
Questions often test the difference between functional earthing and protective earthing, or confuse isolation with insulation. Another trap is assuming a discharged capacitor holds no charge-large capacitors can retain dangerous voltage. Watch EMC questions: shielding addresses radiated emissions, while filtering addresses conducted emissions. In battery questions, thermal runaway and cell balancing are commonly tested. Do not overlook lockout/tagout steps before maintenance.
Worked example
A 400 V capacitor bank stores energy E = ½CV². With 1000 µF, E = ½ × 0.001 × 160000 = 80 J-potentially lethal. Rule of thumb: always discharge and verify with a meter before working, and treat stored energy as a hazard regardless of the supply being off.