FEE Flashcards - Lecture 2-3 (1)

Question 1

unit of electric charge

Answer 1

Coulomb

Question 2

How many Coulombs in an electric charge?

Answer 2

1.6020*10^-19 C

Question 3

How many electrons in 1 Coulomb?

Answer 3

6.24*10^18 e

Question 4

When one coulomb of electric charge passes a given point every second, the electric current is said to be how many amperes?

Answer 4

1

Question 5

Equivalence of Ampere to Coulombs

Answer 5

1 Ampere = 1 Coulomb/sec

Question 6

formula for electric current

Answer 6

I = Q/t (Current = charge / time)

Question 7

Also known as electric pressure

Answer 7

electromotive force

Question 8

Commonly called voltage

Answer 8

electromotive force

Question 9

unit of electromotive force

Answer 9

Voltage

Question 10

When an emf is applied to the ends of a conductor it is proper to refer to existence of a ____ between such ends

Answer 10

potential difference

Question 11

Methods to develop an emf

Answer 11

2. Building a machine which generates voltage when conductors are rotated near magnets
3. Combining certain kinds of metals and chemical into a device (device)

Question 12

One of the fundamental relationships of circuit theory is that between ___, ___, and ___

Answer 12

Voltage (V), Current (I), and Resistance (R)

Question 13

German physicist who investigated the relationship and the properties of resistance

Answer 13

Georg Simon Ohm

Question 14

Resistance of a material depends upon several factors:

Answer 14

Temperature
Type of material
Length of the conductor
Cross-sectional area

Question 15

Relationship between the resistance of a metallic conductor and length of material? what about its cross-sectional area?

Answer 15

directly proportional ; inversely proportional

Question 16

Resistance of a conductor formula (depending on area)

Answer 16

R = ρL/A (Resistance = resistivity*length/cross-sectional area)

Question 17

Unit of resistivity (ρ)

Answer 17

CMΩ/ft. (circular mil-ohm/ft)
Ωm (ohm-meter)

Question 18

Cross sectional area formula

Answer 18

A = πr^2 or A = (πd^2)/4

Question 19

Units of cross-sectional area of a conductor:

Answer 19

Square Mil (sq.mil)
Square meter (m^2)
Square Feet (ft^2)
Circular Mil (CM)

Question 20

Standard unit of measurement of a round wire cross-sectional area

Answer 20

Circular Mil (CM)

Question 21

how many mils in one diameter

Answer 21

1

Question 22

Unit of cross sectional area whose sides are equal to 1-mil

Answer 22

Square Mil

Question 23

Sq. mil to Circular Mil

Answer 23

1 sq. mil = 4/π CM

Question 24

Circular Mil to sq. mil

Answer 24

1 CM = π/4 sq. mil

Question 25

Inches to mil

Answer 25

1 inch = 1000 mil

Question 26

CM to sq. inch

Answer 26

1CM = π/4 * 10^-6 sq. inch

Question 27

sq. inch to CM

Answer 27

1 sq. inch = 4/π * 10^6 CM

Question 28

Resistance of a conductor formula (depending on volume)

Answer 28

R = ρ(l^2/v)
R = ρV/A^2