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Flashcards in Ch 2 Deck (33)
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1

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

True

2

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

True

3

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

True

4

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

True

5

What is the formula for input?

Input = Output / Efficiency

6

How would you find the reciprocal of 1.25?

1 / 1.25

7

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

directly : inversely

8

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 "_______"

Power losses

9

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

All of them

10

What is the Kw of a 75W load?

.075 kW

11

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

True

12

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

resistance , inductive reactance, & capacitive reactance

13

The volume of an enclosure is expressed in ______

Cubic Inches

14

An electrical circuit consists of what three things?

Power Source : Conductors : Load

15

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

Silver : Copper : Gold : Aluminum

16

(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

True

17

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

Negative : Positive

18

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

True

19

(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

False

20

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

True

21

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

Multiplier

22

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

EMF or Potential

23

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

(T/F)

24

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

False

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