Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
It is┬а fatal to touch a live wire as
The voltage may cause burns to the skin
Current may flow through the human body
Current main cause burns to the skin or inside the body
It may cause damage to the heart and nerve system
Current may flow through the human body
Touching a live wire creates a closed electrical circuit through the human body to the ground (or another potential). Because the human body acts as a conductor, it allows current to flow, which is the primary cause of electrical shock and physiological damage.
Touching a live wire creates a closed electrical circuit through the human body to the ground (or another potential). Because the human body acts as a conductor, it allows current to flow, which is the primary cause of electrical shock and physiological damage.
I=RbodyтАЛVтАЛ тАФ Ohm's Law governing the flow of current through the body
P=I2RbodyтАЛ тАФ Power dissipation resulting in thermal burns
The body completes a circuit between the high-potential live conductor and a lower-potential path (usually the earth). According to Ohm's Law, I=RbodyтАЛVтАЛ, where RbodyтАЛ is the electrical resistance of the human body. Even at standard line voltages (e.g., 230V), the body's resistance is low enough to permit currents sufficient to cause muscle tetany, ventricular fibrillation, and thermal damage.
Electrical shock is determined by current magnitude, path, and duration.
The body is primarily composed of water and electrolytes, making it a fair conductor.
Currents as low as 10тБ╗┬▓тБ░ mA can cause 'let-go' threshold failure due to muscle contraction.
Ventricular fibrillation typically occurs if current passes through the heart region.
Electrical Safety Engineering
Earthing and Grounding System Design
Bio-electromagnetics
Standard dry human skin resistance ranges from 1k╬й to 100k╬й, but it drops significantly when wet.
Option C is technically a consequence of the current flow, but Option B identifies the fundamental physical requirement for injury to occur.
B is correct тАФ Touching a live wire completes an electrical circuit, allowing current to flow through the body, which is the necessary condition for electrical injury.
Always remember that current, not voltage, causes injury. Voltage is merely the 'pressure' that forces current through the body's resistance.