Physics Ch. 15
About this set
Created by:
carterhelschien on January 23, 2011
Log in to favorite or report as inappropriate.
Order by
40 terms
Terms | Definitions |
|---|---|
 The unit in which charge is measured is the___. | coulomb |
| An object is___when it has equal numbers of positive and negative charges. | electrically neutral |
| ___exists when there is an excess of one type of charge on an object. | static electricity |
| ___explains the relationship between electric force, charge, and distance. | Coulomb's law |
| ____occurs when clothes brush against each other in the dryer. | charging by friction |
| An____can be used to tell whether an object has a net charge. | electroscope |
| If you use a charged balloon to charge a metal ball through ____, the balloon's net charge does not change. | induction |
| What does it mean to say an object is electrically neutral? | An object is electrically neutral when its net charge is zero. |
| 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. |
| Why don't you usually notice electric forces between objects? | Because most objects are electrically neutral. |
| What two factors determine the amount of electric force between two objects? | the size of the charges and the distance between the charges |
| What happens to the force between two charges as they are moved closer together? | The force between the charges gets stronger. |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| ___is when you rub a balloon on your hair. | charging by friction |
| ___are drawn to show the direction of the electric field. | field lines |
| an object is____if has a net positive charge on one side and a net negative charge on the other side. | polarized |
| There is an____in the region around any charge. | electric field |
| How are the units ampere and coulomb related? | amperes are coulombs per second |
| Ben Franklin defined current as going from ______. Now we know that electrons in a circuit move from ___. | positive to negative; negative to positive |
| Do all the electrons in a wire move to make the current in a circuit? | no, only the valence electrons move |
| Does a battery supply the electrons to a circuit that create current in a circuit? | No |
| 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. |
| 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 |
| A___is used to store electrical energy by separating charge. | capacitor |
| Capacitance is measured in__. | farads |
| What is a capacitor? | A capacitor is a device that stores electrical energy in a circuit. |
| What use do capacitors have? | A charged capacitor can create current in a circuit. |
| 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. |
| 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. |
| Which three factors affect a capacitor's capacitance? | the distance between the plates; the area of the plates; the insulating material between the plates |
| How much charge does a 8.85 farad capacitor hold when charged with a 12 volt battery? | 106.2 Coulombs |
| Find the net charge of an atom that contains each of the following. 4 protons and 14 electrons | -1.602E-18 C |
| How many protons are needed to make 2.4 coulomb of charge? | 1.49e+19 |
| How many electrons are in a coulomb? | 6.24E18 |
| What is the formula for current? Voltage? | Coulomb/sec; joules/coulomb |
First Time Here?
Welcome to Quizlet, a fun, free place to study. Try these flashcards, find others to study, or make your own.