Chapter 3

Question 1

What does electricity concern primarily?

Answer 1

The distribution and movement of electrons

Question 2

What are the two types of electric charges?

Answer 2

Negative and positive

Question 3

What is the first law of electrostatics?

Answer 3

Like charges repel; unlike charges attract

Question 4

What does the inverse square law state?

Answer 4

Force between two charges is directly proportional to the product of their magnitudes and inversely proportional to the square of the distance between them

Question 5

Where do charges reside in solid conductors?

Answer 5

On the external surface

Question 6

Where does the greatest concentration of charges gather?

Answer 6

At the sharpest area of curvature

Question 7

What type of charges move along solid conductors?

Answer 7

Only negative charges

Question 8

What is electrification by friction?

Answer 8

Transfer of charges created by the abrasion of two conductive materials

Question 9

What is the process of electrification by contact?

Answer 9

Physically touching a charged body to a neutral body

Question 10

What is induction in electrification?

Answer 10

Bringing a charged body close to a neutral object without contact

Question 11

What direction do electrons move in an electric current?

Answer 11

From areas of high to low concentration

Question 12

What is the conventional current flow direction?

Answer 12

From positive to negative

Question 13

What does ‘current’ refer to in an electric circuit?

Answer 13

Quantity of electrons flowing

Question 14

What is the unit of current?

Answer 14

Ampere

Question 15

What is resistance measured in?

Answer 15

Ohms

Question 16

What are the four factors that resistance depends on?

Answer 16

[“Material’s conductivity”, “Length”, “Diameter”, “Temperature”]

Question 17

What happens to resistance as the length of a solid conductor increases?

Answer 17

Resistance increases proportionally

Question 18

How does the diameter of a conductor affect resistance?

Answer 18

Inversely related to resistance

Question 19

What happens to resistance as temperature increases?

Answer 19

Resistance increases

Question 20

What is Ohm’s Law formula?

Answer 20

V = I * R

V means volts, I means current in amperes, R means resistence in ohms

Question 21

In Ohm’s Law, what does ‘P’ represent?

Answer 21

Power in watts

Question 22

What happens to total resistance in a parallel circuit as more resistancers are added?

Answer 22

Total resistance drops

Question 23

What device is used for circuit protection?

Answer 23

[“Circuit breaker”, “Fuse”]

Question 24

Electric current is defined as

Answer 24

charge/time

Question 25

What is 1 ampere equal to?

Answer 25

6.24x10^18 per second

Question 26

When an electric current flows through a solid conductor with resistance, energy is

Answer 26

released as thermal energy

Question 27

What is energy potential measured in

Answer 27

Volts

Question 28

What is the job of electric insulators

Answer 28

block movement of electrical charge

Question 29

If the distance between two electrical charges is doubled, what happens to the force between them?

Answer 29

decreased by 1/4

Question 30

What is an ampere

Answer 30

coulomb/sec | unit of current

Question 31

What is resistance?

Answer 31

The opposition to the flow of electrons

Question 32

What is the unit of power

Answer 32

watt | joule/sec

Question 33

In a parallel circuit

Answer 33

the voltage is equal across all branches of the circuit

Question 34

If total voltage is 3 volts and the total resistence of the circuit is 9 ohms. What is the current

Answer 34

1/3 ampere

Question 35

A series circuit with an resistance of 8 ohms and a current of 2 amperes requires what voltage

Answer 35

16 volts

Question 36

Ohm's law is described mathematically as

Answer 36

R=V/I

Question 37

How much resistance is produced in a parallel circuit if 20 volts of potential difference causes a current of 5 amperes to flow

Answer 37

4 ohms

Question 38

A 100 watt light bulb at 0.91amperage is operating at a potential difference of

Answer 38

100 volts

Question 39

If a conductive surface is positivaly charged, it

Answer 39

is deficient in electrons

Question 40

What is a milliampere

Answer 40

unit of current

Question 41

When the atomic valence and conductive bands overlap

Answer 41

electrical flow easily occurs

Question 42

A transformer with more secondary windings than primary windings

Answer 42

has a greater secondary voltage