Alternating Current

Question 1

Define an alternating current.

Answer 1

Alternating current is when charge carriers reverse their direction of motion.

Question 2

Describe the equivalent of an r.m.s value of an a.c.

Answer 2

The r.m.s. value of an a.c.is the value of a steady d.c. that will dissipate energy at the same
rate as the a.c. in a given resistive load.

Question 3

What are the 4 conditions of an ideal transformer?

Answer 3

1. Laminated core to reduce Eddy current loss.
2. Soft iron core to concentrate magnetic flux and reduce flux leakage.
3. Soft iron core or special alloys for core to lower hysteresis loss.
4. Thick wires to reduce the resistance of the wires.

Question 4

Describe the process of rectification.

Answer 4

Rectification is the process of turning an alternating

current power source to a direct current power source.