FAA Powerplant Written Practice Test

What is the purpose of bonding jumpers in an electrical circuit?

1. To create high electrical resistance

2. Provide a low electrical resistance in the ground circuit

3. To isolate circuits from ground

4. For aesthetic purposes in wiring

The correct answer is: Provide a low electrical resistance in the ground circuit

The primary purpose of bonding jumpers in an electrical circuit is to provide a low electrical resistance in the ground circuit. This is essential for ensuring that any fault current can safely return to the ground, minimizing the risk of electric shock or electrical fires. By maintaining low resistance, bonding jumpers help to ensure the effectiveness of grounding systems, allowing for the safe operation of electrical equipment and protecting personnel. In grounding applications, particularly in aircraft and other critical systems, ensuring a reliable path for electrical currents is vital for equipment performance and safety. High resistance would hinder this process, making it difficult for fault currents to dissipate, which could lead to equipment failure or unsafe conditions. Therefore, the correct response underscores the importance of maintaining a low-resistance path in grounding circuits through the use of bonding jumpers.