Electricity 1-7 Deck

Front 1

Electricity 2B3 Exam

Back 1

Study with Mom

Front 2

What can limit current flow in an AC circuit?

Back 2

An inductant or capacitant

Front 3

When a varying current flows in a conductor, it creates;

Back 3

a magnetic field which induces an EMF in the conductor

Front 4

the magnitude of a self induced emf is:

Back 4

proportional to the amplitude and frequency of the current

Front 5

self induction can be considered an:

Back 5

exchange of energy when the magnitude of the current through a conductor changes

Front 6

Inductance is that property of an electrical circuit that:

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tends to oppose and change in current through the circuit

Front 7

A coil is said to be saturated when:

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when even large changes in current cannot increase the flux and very little cemf is produced

Front 8

Mutual induction exists between two coils when:

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the flux lines generated in one coil cut the turns of another

Front 9

With an open secondary, the secondary transformer voltage is:

Back 9

180 degrees out of phase with the primary voltage

Front 10

Transformers make use of:

Back 10

the mutual induction between two coils or windings

Front 11

Shorting the secondary on a tranformer can cause:

Back 11

the primary to draw excessive current

Front 12

The value of the secondary load on a transformer has an effect on:

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the phase angle between primary voltage and current, and secondary voltage and current

Front 13

In an ideal transformerthe primary power

Back 13

equals the power in the secondary

Front 14

The ratio of the number of turns in the primary (transformer) to the number of turns in the secondary is called

Back 14

the turns ratio

Front 15

The ratio of the primary to the secondary voltage is

Back 15

equal to the turns ratio

Front 16

The ratio of the secondary to the primary current is

Back 16

equal to the turns ratio

Front 17

The ampere turns of the primary is equal to the

Back 17

ampere turns of the secondary

Front 18

In multiple secondary tranformers, the total power in the promary is equal to the:

Back 18

sum of the power in the secondaries

Front 19

Air-core transformers are wound around ________ and the flux lines pass through __________

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insulating forms
the air between the windings

Front 20

Iron core transformers provide:

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a better path for the flux lines

Front 21

The autotransformer has only

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one winding which is tapped

Front 22

What is a disadvantage of an autotransformer?

Back 22

the lack of isolation between the primary and secondary circuits

Front 23

Variable transformers have _________ or ____________ which permits the transformer to have various voltages

Back 23

sliding contacts
different taps

Front 24

List the possible transformer losses

Back 24

copper loss, leakage, hysteresis loss, eddy current loss, and saturation loss

Front 25

Capacitance exists whenever

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two conductors are separated by an insulating material and have a potential difference between them

Front 26

A charged capacitor has an __________ existing between the plates

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electric field or electrostatic force

Front 27

The capacitor voltage is often called the counter voltage because:

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it acts 180 degrees out of phase with the applied voltage

Front 28

The apparent power of a circuit with capacitance and impedance is:

Back 28

the power supplied to the circuit by the source

Front 29

The true power of a circuit with capacitance and impedance is:

Back 29

the power consumed by the circuit