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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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State the consequences of an electrical accident.
Electric shock
Fire
Both
None of above
Both
Quick Summary: Electrical accidents occur due to the unintended flow of current through a human body (electric shock) or through path-of-least-resistance faults that generate intense heat (fire). Both electric shock and fire are critical hazards associated with electrical equipment failure, insulation breakdown, or overloading.
Electrical accidents occur due to the unintended flow of current through a human body (electric shock) or through path-of-least-resistance faults that generate intense heat (fire). Both electric shock and fire are critical hazards associated with electrical equipment failure, insulation breakdown, or overloading.
I=RbodyV — Current flowing through the human body during shock
P=I2R — Power dissipation causing localized heating and ignition
Electric shock results when a body completes a circuit between two potentials, causing current I=RbodyV to flow, where Rbody is the resistance of human tissue. Electrical fire occurs due to I2R heating (Joule heating) in high-resistance connections or insulation failure causing arcing, which can ignite surrounding combustible materials.
Electric shock severity depends on current magnitude, duration, and the current path through the body.
Electrical fires are often caused by short circuits, overloads, or poor terminal contact (arcing).
Proper grounding and the use of Residual Current Devices (RCDs) are essential for shock prevention.
Circuit breakers and fuses are critical to prevent fire by cutting power during overload conditions.
Ventricular fibrillation in humans typically occurs when current reaches 50-100 mA at 50/60 Hz.
Option B (Fire) is correct but incomplete as shock is also a primary consequence, making option C the comprehensive choice.
C is correct — Electrical accidents fundamentally manifest either as physiological harm (electric shock) or property/environmental damage (fire) caused by thermal energy.
In competitive exams, 'Both' or 'All of the above' is frequently the correct answer for safety-related questions because electrical risks are inherently multi-faceted.