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Low Voltage > Test 10 > Flashcards

Test 10 Flashcards

1
Q

It takes _______ time constants for a circuit to reach full value

A

5

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2
Q

On a transformer _________ lags ________ by _________degrees

A

Current lags voltage by 90 degrees

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3
Q

What is the movable part of a relay

A

Armature

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4
Q

What is the purpose of an solenoid

A

Convert an electrical signal to a mechanical motion

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5
Q

More windings on a primary coil is a ________ transformer

A

Step down

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6
Q

Inductive resistance formula

A

Xl= 2pi x fL

Inductive resistance = 2 times 3.14 times frequency times inductance

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7
Q

H =

L =

A

H is Henry

L is inductor

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8
Q

Inductance of a coil is inversely proportional to its _______

A

Length

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9
Q

In an inductor _________ leads __________

A

Voltage leads current

Eli the iceman

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10
Q

More current equals ________ magnetic field

A

Stronger

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11
Q

When electrons flow __________ and ___________ are created

A

Heat and a magnetic field

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12
Q

4 factors affecting inductance

A

Permeability of core material
Number of turns of wire
Core length
Cross sectional area of the core

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13
Q

What are the two parts of a relay

A

Coil and set of switch contacts

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14
Q

What are the two parts of a solenoid

A

Coil and plunger

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15
Q

Counter EMF can happen when current is ________

A

Increased

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16
Q

Inductance is measured in

A

Henries

17
Q

More windings on secondary coil is a _______ transformer

A

Step up

18
Q

EMF is over in _______ time constants

A

5

19
Q

What type of transformer has a turns ratio of less than 1

A

Step down

20
Q

In a series RL circuit the voltage across a resistor is in ________ with the current

A

Phase

21
Q

T = _____/_______

A

T = L/R

22
Q

Counter EMF is created when electrons __________ and then it ___________

A

First begin moving and then it fades away

23
Q

Changing magnetic field

A

Induces current

24
Q

Inductors ___________ a change in current

A

Oppose

Low Voltage (9 decks)

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