Principles of ac Circuits

Question 1

Resistance affects the current in an ac circuit by opposing the _____ _____ _____

Answer 1

flow of electrons

Question 2

Inductance affects the current in an ac circuit by opposing any _____ _____ _____

Answer 2

change in current

Question 3

capacitance affects the current in an ac circuit by opposing any _____ _____ _____

Answer 3

change in voltage

Question 4

When the voltage of any ac circuit is divided by the current, the resulting ohmic value is called _____ and its unit is _____

Answer 4

impedance, ohms

Question 5

resistance, inductive reactance and capacitive reactance are measured in _____

Answer 5

ohms

Question 6

List the four factors that can cause the ac resistance to be higher than the dc ohmic value

Answer 6

skin effect, dielectric, hysteresis, eddy currents

Question 7

The _____ loss is caused by ac voltage stresses within the insulation of the conductor

Answer 7

dielectric

Question 8

There is a tendency for an ac current flow more toward the outer part of the doncutro. This is called:

Answer 8

skin effect

Question 9

the energy losses caused by the constant reversals of the magnetic domains within the core material are called the _____ losses

Answer 9

hysteresis

Question 10

electric currents are set up within the core material by the constantly reversing field. The energy losses due to these currents in the core are called _____ _____ losses

Answer 10

eddy currents

Question 11

laminating the magnetic cores of ac equipment is done to reduce the _____ _____

Answer 11

eddy currents

Question 12

using silicon steel for the core material of ac equipment reduced the ____ losses

Answer 12

hysteresis