Ch 2 Flashcards

1
Q

(T/F) Smaller conductors have greater resistance and larger conductors have lower resistance

A

True

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2
Q

(T/F) According to the Conventional Current Flow Theory, a positive charge flows from positive to negative in the circuit

A

True

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3
Q

(T/F) Power is not equal to E x I for ac circuits because consideration must be given to inductive reactance

A

True

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4
Q

(T/F) Often the resistance of the power source and conductor are ignored in circuit calculations

A

True

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5
Q

What is the formula for input?

A

Input = Output / Efficiency

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6
Q

How would you find the reciprocal of 1.25?

A

1 / 1.25

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7
Q

The Ohm’s Law formula, I = E/R, states that current is _____ proportional to the voltage and ____ proportional to the resistance.

A

directly : inversely

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8
Q

Power in a circuit can be either “useful” or “wasted”. Wasted work is still energy used; therefore it must be paid for, so we call this “_______”

A

Power losses

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9
Q

Ohm’s Law demonstrates the relationship between circuit _____ (intensity, EMF, or resistance)

A

All of them

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10
Q

What is the Kw of a 75W load?

A

.075 kW

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11
Q

(T/F) Squaring a number means multiplying the number by itslef

A

True

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12
Q

In an ac circuit, the factors that oppose current flow are ______

A

resistance , inductive reactance, & capacitive reactance

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13
Q

The volume of an enclosure is expressed in ______

A

Cubic Inches

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14
Q

An electrical circuit consists of what three things?

A

Power Source : Conductors : Load

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15
Q

Put these conductors in their order for conductivity: Gold, silver, copper aluminum

A

Silver : Copper : Gold : Aluminum

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16
Q

(T/F) The work that ca be performed by moving electrons depends on the circuit pressure and the circuit’s opposition to the flow of electrons

17
Q

According the the Electron Current Flow Theory, electrons leave the _____ terminal of the source, flow through the conductors and load(s) and return to the _____ terminal of the source

A

Negative : Positive

18
Q

(T/F) The major advantage of ac over dc is the ease of voltage regulation by the use of a transformer

19
Q

(T/F) The voltage applied to a resistor dramatically affects the power consumed by that resistor because power is affected in direct proportion to the voltage

20
Q

(T/F) DC power is determined by multiplying the electromotive force by the circuit intensity

21
Q

The method of increasing a number by another number is done by using a _______

A

Multiplier

22
Q

Electrical pressure is called “______”, and it is measured in volts.

A

EMF or Potential

23
Q

(T/F) Conductance is the property that permits current to flow

24
Q

(T/F) Deriving the square root of a number is almost the same as squaring a number

25
(T/F) The polarity and the output voltage from a dc power source changes direction
False
26
How do you find the reciprocal of a number?
Turn that number into a decimal and divide it into the number 1
27
(T/F) According to the Electron Current Flow Theory, electrons flow away from the negative terminal of the source, through the circuit and load, toward the positive terminal of the source
True
28
In electrical systems, the volume of electrons that move through a conductor is called the "circuits _____"
Intensity
29
"______" is defined as the rate of work measured by the unit called the watt
Power
30
(T/F) Aluminum has lower resistance to the flow of electrons than does copper
False
31
to change a percent value to a decimal or whole number, drop the percentage sign and move the decimal point two places to the _______
Left
32
(T/F) Every component of an electrical circuit contains resistance, except the power supply.
False
33
The formulas in the formula wheel apply to ______
dc and ac circuits with unity power factor