Question

question 28 = multiple choice question
which of the following is described as a current that reverses its direction many times a second at regular intervals?
direct current
solar current
surface current
alternating current
question 29 = multiple choice question
which of the following is described as a current that always flows in the same direction?
direct current
alternating current
solar current
surface current

Explanation:

Alternating current changes direction regularly. Direct current flows in one - direction only. Solar and surface currents are not relevant here.

Answer:

Question 28: D. alternating current
Question 29: A. direct current