VI Scan text B to fill in the spaces with the prepositions.

1 When the grounded leg __ the circuit connects __a good electrical conductor,

this conductor may serve as one leg __ the circuit, cutting __ the need __ a

separate conductor.

2 Although the grounds are __ different points, the potential __ these points is the

same since they connect __ a common conductor.

3 Any wire designated as N may come __ contact __ ground __any point

__causing the equipment __ malfunction.

4 Grounding three-wire systems can be done __ grounding one of the phases,

usually the B-phase __ aircraft.

5 A disadvantage __ a grounded system is that short circuits result when a bare

spot _ any ungrounded conductor touches ground.

6 The term ungrounded system means that the circuit __ no way connects __

ground.

7 All conductors run __ the power source __the loads.

8 The ungrounded system has one advantage—it prevents one circuit __ feeding __ another because the circuits are completely insulated __ each other.

9 Both the grounded and ungrounded systems are used __ specific purposes __

modern aircraft. 10 Single-phase power is available __ polyphase systems.

11 The term grounded system means that one leg __ the system connects __ a

common conductor.

12 Although the grounds are __ different points, the potential __ these points is the

same since they connect __ a common conductor.

13 Any wire designated as N may come __contact __ ground __ any point __

causing the equipment __ malfunction.

14There is a possibility __ one circuit feeding __ another.

15All conductors run __ the power source __ the loads.

16Circuits __this type are often referred __ as being __ground.