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NEC > Tom Henry > Flashcards

Tom Henry Flashcards

1
Q

An alternation is

A

one-half cycle

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2
Q

__________ Is the ability of a material to permit the flow of electrons

A

Conductance

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3
Q

What is the opposite of resistance

A

Conductance

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4
Q

Readily accessable

A

The ability to touch

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5
Q

Concealed

A

Buried in a wall

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6
Q

In wire 1 H indicates

A

75deg C

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7
Q

In wire 2 H’s indicates

A

90deg C

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8
Q

60 cycle frequency travels 180 degrees in how many seconds

A

1/120

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9
Q

The total opposition to the current flow in an AC circuit is expressed in ohms and is called

A

Impedance

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10
Q

What is the symbol for impedance

A

the letter Z

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11
Q

What is a short circuit

A

A very low resistance between the circuit conductors

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12
Q

Materials containing numerous free electrons are

A

good conductors

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13
Q

How many VA are required per sq foot in a house

A

3va

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14
Q

An AC ammeter or voltmeter is calibrated to read RMS values, this means the meter is reading the _______value

A

Effective

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15
Q

Electric current is measured in terms of

A

Electrons passing a point per second

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16
Q

An overcurrent protective devise with a circuit opening fusible part that is heated and severed by the passage of overcorrect through it is called a

A

Fuse

17
Q

A fixture that weighs more than _______ lb shall be supported independently of the outlet box

A

50lb

18
Q

Voltage drop in a wire is

A

A percentage of the applied voltage

19
Q

Electric power (watts) is a measure of

A

A rate at which work is performed

20
Q

The electric pressure of a circuit is __________

A

Voltage

21
Q

What percentage of the maximum (peak) voltage is the effective (RMS) voltage

A

70.0%

22
Q

In an AC circuit the ratio of the power in watts to the total volt-amps is called

A

Power factor

NEC (5 decks)

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