Deck 6: Capacitors in Alternating-Current Circuits

Question 1

What is the principle of the conservation of energy?

Answer 1

This principle states that the total power supplied to a circuit is equal to the sum of the values of power consumed in each of the individual circuit components.

Question 2

Capacitors may be considered as ____________________ of magnetizing VARs.

Answer 2

sources

Question 3

Inductance in an ac circuit causes a countervoltage.

Answer 3

True

Question 4

Explain what may happen when a capacitor that is not designed for ac service is used with ac service.

Question 5

Coils can be viewed as requiring or ____________________ magnetizing VARs.

Question 6

Capacitors that are used in either ac or dc circuits have a rating known as the ____________________ voltage.

Question 7

Inductive load equipment such as fluorescent light ballasts, power distribution lines, and induction motors all require capacitors to ensure the supply of magnetizing VARs.

Question 8

In ac power systems, an adequate supply of both watts and magnetizing VARs must be available.

Question 9

When is a circuit said to be in resonance?

Question 10

The current-limiting effect of capacitance in an ac circuit is called ____________________.

Question 11

How is the current, in amperes, in an ac circuit containing capacitance determined?

Question 12

Describe the power factor of a capacitor.

Question 13

A capacitor is charged when an ac voltage is applied to its terminals.

Question 14

If a pure inductance is connected to an ac source, the current lags the applied voltage by ____________________ electrical degrees.

Question 15

The principle of the conservation of energy cannot be applied to steady-state ac circuit theory.