1.
____occurs when clothes brush against each other in the dryer.: charging by friction
2.
___are drawn to show the direction of the electric field.: field lines
3.
___exists when there is an excess of one type of charge on an object.: static electricity
4.
___explains the relationship between electric force, charge, and distance.: Coulomb's law
5.
___is when you rub a balloon on your hair.: charging by friction
6.
A___is used to store electrical energy by separating charge.: capacitor
7.
an object is____if has a net positive charge on one side and a net negative charge on the other side.: polarized
8.
An object is___when it has equal numbers of positive and negative charges.: electrically neutral
9.
An____can be used to tell whether an object has a net charge.: electroscope
10.
Ben Franklin defined current as going from ______. Now we know that electrons in a circuit move from ___.: positive to negative; negative to positive
11.
Capacitance is measured in__.: farads
12.
Do all the electrons in a wire move to make the current in a circuit?: no, only the valence electrons move
13.
Does a battery supply the electrons to a circuit that create current in a circuit?: No
14.
Explain what happens to the force between two protons if each of the following occurs: One of the protons is replaced with an electron.: the force becomes attractive
15.
Explain what happens to the force between two protons if each of the following occurs: The distance between is doubled.: the force decreases by four times
16.
Explain what happens to the force between two protons if each of the following occurs: The distance between them is cut in half.: force increases by four times
17.
Explain what happens to the force between two protons if each of the following occurs: The distance between them is tripled.: the force decreases by nine times
18.
Explain what happens to the force between two protons if each of the following occurs:One of the protons is replaced with two electrons.: force is attractive and increases by two times
19.
Find the net charge of an atom that contains each of the following. 4 protons and 14 electrons: -1.602E-18 C
20.
How are the units ampere and coulomb related?: amperes are coulombs per second
21.
How does the charge of an electron compare to the charge of a proton?: The charge of an electron is equal to the charge of a proton with the opposite sign.
22.
How many electrons are in a coulomb?: 6.24E18
23.
How many protons are needed to make 2.4 coulomb of charge?: 1.49e+19
24.
How much charge does a 8.85 farad capacitor hold when charged with a 12 volt battery?: 106.2 Coulombs
25.
If you use a charged balloon to charge a metal ball through ____, the balloon's net charge does not change.: induction
26.
One volt equals one ___of energy per __of charge. A volt is also equal to one ____of power per___of current.: joule, coulomb; watt, ampere
27.
The unit in which charge is measured is the___.: coulomb
28.
There is an____in the region around any charge.: electric field
29.
What does it mean to say a capacitor is charged?: A capacitor is charged when one plate is positively charged and the other is negatively charged.
30.
What does it mean to say an object is electrically neutral?: An object is electrically neutral when its net charge is zero.
31.
What happens to the charges in your hair and a balloon if you rub them together?: hair will become positively charged; balloon will become negatively charged
32.
What happens to the current in a circuit as a capacitor charges?: The current in a circuit containing a capacitor decreases to zero as the capacitor charges.
33.
What happens to the force between two charges as they are moved closer together?: The force between the charges gets stronger.
34.
What is a capacitor?: A capacitor is a device that stores electrical energy in a circuit.
35.
What is the formula for current? Voltage?: Coulomb/sec; joules/coulomb
36.
What two factors determine the amount of electric force between two objects?: the size of the charges and the distance between the charges
37.
What use do capacitors have?: A charged capacitor can create current in a circuit.
38.
Which three factors affect a capacitor's capacitance?: the distance between the plates; the area of the plates; the insulating material between the plates
39.
Why can current easily be created in a conductor but not in an insulator?: Because conductors have electrons that are free to move and insulators do not.
40.
Why don't you usually notice electric forces between objects?: Because most objects are electrically neutral.
