Final answer:
The answer is Option A.The given values represent the probability of system failure due to excessive current in the system wiring.
Step-by-step explanation:
The values given, P(excessive current in system wiring)=3×10−6 and P(power applied to the system for an extended time)=6×10−6, represent the probabilities of specific events occurring in an electrical system. These values could indicate the likelihood of certain conditions that may lead to system failure due to thermal hazards. When current or power exceeds safe levels, components such as wires can overheat, potentially leading to failure. Systems include safety measures, such as fuses and circuit breakers, to prevent damage by interrupting the current flow in such events. Therefore, the correct answer is (a) Probability of system failure.
The values represent the probabilities of events that could lead to system failure caused by excessive current and overheating, with safety devices like fuses and circuit breakers used to mitigate risks.