Question

Statement I: $AC$ is more dangerous than $DC$.
Statement II: Frequency of $AC$ is dangerous for human body.

• A. If both statements are true and statement II is the correct explanation of statement $I$.
• B. If both statements are true but statement II is not the correct explanation of statement $I$.
• C. If statement $I$ is true but statement II is false.
• D. If both statements are false.

Answer 1

Answer: (A)

The effect of $AC$ on the body depends largely on the frequency. Low frequency currents of $50$ to $60Hz$ (cycles/sec), which are commonly used, are usually more dangerous than high frequency currents and are $3$ to $5$ times more dangerous than DC of same voltage and amperage (current). The usual frequency of $50cps$ (or $60cps$ ) is extremely dangerous as it corresponds to the fibrillation frequency of the myocardium. This results in ventricular fibrillation and instant death.