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Midterm Units 9-12 > Unit 12 > Flashcards

Unit 12 Flashcards

1
Q

Continually and rapidly reversing current 

A

Alternating current

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2
Q

Protects the circuit from an overload

A

Circuit breaker

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3
Q

Device used to measure resistance

A

Ohmmeter

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4
Q

Component that is neither a conductor or insulator, but a partial conductor

A

Semiconductors

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5
Q

Coil of wire wrapped around an iron core that induces a current to another coil of wire, wrapped around the same iron core

A

Transformer

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6
Q

Unit of power

A

Watts

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7
Q

Smallest amount of a substance that can exist

A

Atom

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8
Q

Used to measure current without breaking a circuit to install the meter

A

Clamp on meter

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9
Q

Amount of charge that can be stored

A

Capacitance

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10
Q

When an atom has more electrons than protons

A

Negative charge

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11
Q

Total voltage is applied across each resistance. Current is divided between the different loads, and total current is equal to the sum of the current in each branch. Total resistance is less than the value of the smallest resistance.

A

Parallel circuit

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12
Q

Used to measure current in a circuit

A

Ammeter

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13
Q

Materials with a few electrons in the outer orbit, such as gold, silver, copper and aluminum

A

Conductor

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14
Q

Has a negative charge and travels around the nucleus in orbits or shells

A

Electron

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15
Q

Total effect of resistance in a circuit consist of pure resistance, inductive, reactants, and capacitive reactants

A

Impedance

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16
Q

A resistor that is sensitive to temperature

A

Thermistor

17
Q

A force causing a magnetic field to attract ferrous materials, or where light poles of a magnet repel, and unlike poles, attract each other

A

Magnetism

18
Q

May be used as a switch or a device to amplify an electrical signal

A

Transistor

19
Q

Voltage is divided across the different resistances. Total current flows through each resistance or load. Resistances are added together to obtain total resistance.

A

Series circuit

20
Q

Device that allows heat to be dissipated into the surrounding air

A

Heat sink

21
Q

T/F
In a capacitive circuit, volt lags current

A

True

22
Q

T/F
Total resistance of a parallel circuit is less than the value of the smallest resistance

A

True

23
Q

T/F
Current in a series circuit is the same, regardless of where it is measured

A

True

24
Q

T/F
In a pure resistive circuit, voltage lead current

A

False

25
Q

T/F
If wire is wound into a coil, and a circuit is passed through it, the coil, carrying an electrical circuit is called a solenoid/electromagnet

A

True

26
Q

T/F
Electrons flow from positive to negative in a direct current circuit (DC)

A

False

27
Q

T/F
Inductive loads, primarily generate a magnetic field, whereas resistive load generate light and or heat

A

True

28
Q

T/F
Lightbulbs in a serious circuit will all have the same bright, regardless of the resistance, and each lightbulb

A

False

29
Q

T/F
As resistance in a circuit increases, current decreases

A

True

30
Q

T/F
A rectifier is used to change AC current into DC current

A

True

31
Q

The full load amperage (FLA) reading on a fan motor data plate is 1.5A. What is the lock rotor amperage (LRA) for the fan motor? 

A

7.5A. Divide LRA by 5 to get FLA

32
Q

The proper way to discharge a capacitor before testing it is to use a resistor that has a resistance of _______ Kohms and rated for __________watts

A

20K ohms ; 5watts

33
Q

How are the three terminals on a dual capacitor marked?

A

Common, herm, fan

34
Q

As temperature in a wire increases, resistance _____________.

A

Increases

35
Q

What would the voltage in a DC circuit be if there were a current flow of .5 A and a load resistance of 50 ohms?

A

25 volts.

36
Q

Draw the electrical symbol for a temperature switch that closes on the rise, commonly used and a cooling thermostat

A
37
Q

Draw the electrical symbol for a pressure switch in a normally closed position (N.C)

A
38
Q

Draw the electrical symbol for an air core transformer

A

Midterm Units 9-12 (4 decks)

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