Capacitors Flashcards

1
Q

Capacitors are devices that oppose a change of voltage.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Energy is stored in ? in a capacitor.

A

an electrostatic field

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

The time it takes to charge and discharge a capacitor is measured in ? .

A

time constants

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

The basic unit of capacitance is the ? .

A

farad

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Voltage across a capacitor lags the current through the circuit by ? .

A

90 degrees

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Capacitors are constructed to allow current to flow through them.

A

False

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Charging or discharging a capacitor takes ? .

A

5 time constants

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

A capacitor can perform a variety of tasks, including ? .

A

storing an electrical charge, making a correction to power factor, or providing voltage for timing circuits

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Power factor correction is not one of the main functions of a capacitor. Power factor is corrected by the substation transformer.

A

False

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

The voltage rating of a capacitor is actually the rating of the ? .

A

dielectric

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

When a capacitor charges and discharges during each time constant, the voltage will change by ? of the amount left to reach the fully-charged state.

A

63.2%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

When looking at the current charging a capacitor and the voltage across the capacitor, the current is at a maximum when the voltage is ? .

A

changing the fastest

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

The faster the frequency of a circuit, the faster a capacitor charges and discharges.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Customers with motors that have a low power factor are a desirable load for an electrical provider.

A

False

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

A transformer is an example of a(n) ? load that would cause low power factor.

A

inductive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

The total or apparent power required by an inductive device is a composite of ? and ? .

A

KW/kVAR

17
Q

Power factor is equal to real power divided by ? .

A

apparent power

18
Q

Reactive power required by inductive loads increases the amount of kilovolt-amperes a supplier must provide.

A

True

19
Q

Customers with inductive loads and a power factor of less than ? are normally charged a penalty fee.

A

95%

20
Q

If a circuit is balanced, all of the energy released by the inductor is absorbed by the ? .

A

capacitor

21
Q

By conducting load studies and properly sizing and placing ? , an electrical provider can reduce the kilovolt-amperes that have to be delivered to a customer.

A

Capacitors