4. Complete the sentences using the correct variant: 1. D.c. is a current that a) changes its direction of flow.
b) flows in one direction.
2. A.c. flows provided
a) a direct voltage source is applied.
b) an alternating voltage source is applied.
3. In an alternating cur-
rent circuit
I
a) current flows in one direction 60 times per
second
b) current flows in one direction 60 times and in
the other direction 60 times per second.

a) can be changed into d.c.
b) cannot be changed into d.c.
4. A.C.​

EtoBolshayaProblema    3   18.01.2021 21:33    433