Contact with any energized electrical system conductor is potentially hazardous and precautions should be taken to prevent exposure. With all other factors considered equal (such as voltage, conducting path through the body and the duration of contact), contact with an energized electrical system conductor of which system type would produce the most damaging effect?
• Physiological effects of electric shock at different frequencies (DC vs low-frequency AC vs high-frequency AC) • How 60 Hz power frequency interacts with heart rhythm and muscle control ("let-go" current) • How very high frequency AC (kHz range) tends to affect mainly the skin surface vs deep tissue and heart
• Compare how DC, 60 Hz AC, and 10 kHz AC each affect muscles, nerves, and the heart when the same current passes through the body for the same time. • Think about which system type is most likely to cause ventricular fibrillation (dangerous heart rhythm) at relatively low current levels. • Ask yourself: in real-world power distribution on ships and shoreside, which frequency is standard and why are shock protection rules especially strict around it?
• Verify which frequency range is most associated with ventricular fibrillation and "let-go" thresholds in safety references. • Confirm whether very high-frequency AC (kHz) tends to cause more surface heating (burns) or deep heart interference at the same current level. • Remember that the question states "all other factors considered equal" (voltage, path, time), so focus only on the system type and frequency.
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