Fundamentals of Electricity & Electronics
What is the primary purpose of a fuse or circuit breaker installed in an aircraft electrical circuit?
Answer
To protect the wiring from excessive current caused by an overload or short circuit
Circuit protection devices open the circuit when current exceeds a safe value, protecting the wiring from overheating due to an overload or short. Holding voltage constant is the job of a voltage regulator, a protective device limits rather than increases capacity, and converting AC to DC is done by a rectifier.
Source: FAA-H-8083-30B, Ch. 12 (Fundamentals of Electricity & Electronics), 'Circuit Protection Devices — Fuses and Circuit Breakers'
Not the answer
- To increase the current-carrying capacity of the circuit
- To convert alternating current into direct current
- To hold the system voltage at a constant regulated value
Practice this
The FAA Aviation Mechanic General knowledge test is 60 questions and takes 42 correct — 70% — to pass. The app’s page carries a free ten-question test drawn from the same bank, marked as you go.
Take the free practice test