electricity

Question 1

what is electricity

Answer 1

the phenomena caused by postive and negative charges

Question 2

what’s an electrical charge

Answer 2

a property of protons and electrons

Question 3

what’s the coulomb

Answer 3

the unit of measure for electrical charge (C)

Question 4

what is transferred during an electrical charge

Answer 4

electrons

Question 5

why are only electrons transferred during an electrical charge and not protons

Answer 5

protons are trapped within the nucleus therefore they cant move & electrons move freely around the nucleus

Question 6

what is the range of protons and electrons in a neutral object

Answer 6

same amount of protons & electrons

Question 7

what is the range of protons and electrons in a positively charged object

Answer 7

more protons, less electrons (lost e-)

Question 8

what is the range of protons and electrons in a negatively charged object

Answer 8

more electrons, less protons (gained e-)

Question 9

can an object gain or lose protons

Answer 9

no, can only gain or lose electrons

Question 10

what’s the coulomb’s law

Answer 10

the force of attraction or repulsion between 2 charged particles determined by the amount of charge and the distance between the charge

Question 11

what’s the formula to find the electric force (Fe)

Answer 11

Fe= kq1q2/r(squared)

Question 12

in the electric force formula, what is:
-k
-q1
-q2
r

Answer 12

-k=coulombs constant (9x10^9Nm(squared)/C)
-q1= the charge of the first particle (in C)
-q2= the charge of the second particles (in C)
-r= distance between the 2 particles

Question 13

which type of electrical charges attract each other and which repel each other

Answer 13

electrical charges of opposite sign attract each other
electrical charges with like signs repels each other

Question 14

what’s the law of conservation of charge

Answer 14

states that electrical charges can neither be created nor destroyed; they can only be transferred from one body to another

Question 15

what’s a conductor

Answer 15

substance that permits the free flow of electrical charges

Question 16

what’s an insulator

Answer 16

substance that impedes the free flow of electrical charges

Question 17

what’s a semiconductor

Answer 17

substance that exhibits variable conductivity depending on different factors (ex: metalloids, carbon, silicon)

Question 18

what’s static electricity

Answer 18

describes the phenomena of electrical charges at rest

Question 19

how do we know when an object is charged by friction (3)

Answer 19

• 2 objects are neutral
• they are rubbed together and one loses electrons
• the other object gains them

Question 20

what is the triboelectric series (3)

Answer 20

• 2 items from the list are rubbed together
• the item higher on the list with be more positive (lose e-)
• the lower one will be negatively charged (gain e-)

Question 21

what’s charging by conduction (3)

Answer 21

• one charged object and one neutral object
• the charge of one of the objects is shared between them
• 2 objects with like charges

Question 22

what’s charging by induction

Answer 22

• charged object and one neutral object
• the proximity of the charged object causes the charges of the neutral object to separate
• one charged object and one carrying a partial positive charge on one side and a partial negative charge on the other

Question 23

what’s a pith ball

Answer 23

small chunk of material capable of keeping an electric charge very well

Question 24

which tool is used to observe charging by induction

Answer 24

pith ball