| A | B |
|---|
| Alternating current | Current in which the electrons reverse their direction regularly |
| Battery | Device that produces electricity by converting chemical energy into electrical energy; make up of electrochemical cells |
| Charge | Physical property of matter that can give rise to an electric force of attraction or repulsion |
| Circuit | Complete path through which electricity can flow |
| Circuit breaker | Reusable device that protects a circuit from becoming overloaded |
| Conduction | Transfer through a substance or from one substance to another by direct contact of molecules; method of charging an object by allowing electrons to flow through one object to another object |
| Conductor | Material which permits electrons to flow freely or transfers heat more easily than other substances |
| Current | Flow of charge |
| Direct current | Current consisting of electrons that flow constantly in one direction |
| Electroscope | Device consisting of a metal rod with two thin metal leaves at one end that can be used to detect radio activity or charge |
| Electric discharge | Loss of static electricity as electric charges move off an object |
| Electric field | Region of space around a charged particle in which a force is exerted on other charged particles |
| Friction | Force that acts in the opposite direction of motion; will cause an object to slow down and finally stop |
| Fuse | Thin strip of metal used for safety because when a current flowing through it becomes too high, it melts and breaks the flow of electricity |
| Induction | Method of charging an object by rearranging its electric charges into groups of positive charge and negative charge |
| Insulator | Material made up of atoms with tightly bound electrons that are unable to flow freely; substance that does not conduct electricity easily. |
| Ohm’s law | Electrical law that states that the current in a wire (I) is equal to the voltage (V) divided by the resistance (R) ; also can be stated as V=I x R |
| Parallel circuit | Circuit in which different parts are on separate branches; if one part does not operate properly, current can still flow through the others |
| Photocell | Device that uses electrons emitted from a metal during the photoelectric effect to produce current |
| Potential difference | Difference in charge created by opposite posts of a battery |
| power | Rate at which work is done or energy is used |
| Resistance | Opposition to the flow of electric charge |
| Series circuit | Circuit in which all parts are connected one after another’ if one part fails to operate properly, the current cannot flow |
| Static electricity | Movement of charges from one object to another without further movement |
| Superconductor | Material in which resistance is essentially zero at certain low temperatures |
| Thermocouple | Device that produces electrical energy from heat energy |
| Voltage | Potential difference; energy carried by charges that make up a current |
| Describe the charged particles of an atom? | The magnitude or size of the charge on the protons is the same as the magnitude of the charge on protons. Electron is negative and the proton is positive. |
| What are some examples of force? | Earth's pull on a moon and kicking a ball push. |
| What is the rule of electric charges? | Like charges repel unlike charges attract. |
| What are three ways an object can acquire an electric charge? | Friction, conduction, inductor |
| If the body of a kangaroo contains millions of charged particles, why aren’t different kangaroos electrically attracted to or repelled by one another? | A kangaroo is made up of both protons and electrons. So there is no attraction. |
| HOW does an electrochemical cell produce an electric current? | Electrochemical cells convert chemical energy into electric energy. |
| Compare a series circuit to a parallel circuit. | A series circuit one branch and a parallel circuit separate braches. |
| What would happen if your home were not wired in parallel? | Every thing would go out. |
| What happens if you touch an exposed electric wire? Why is this situation worse if you are wet or standing in water? | When you touch an exposed wire you will get a shock. The electricity passes through you on the way to ground. |
| An atomic particle that caries a negative electric charge is called an | electron |
| Between which particles would an electric force of attraction occur? | Electron proton |
| Electricity cannot flow through which of the following | Closed circuit |
| Electric power is measure in | watts |
| Electricity resulting from a buildup of electric charges is | Static electricity |
| When electrons move back and forth reversing their direction regularly, the current is called | Alternating current |
| The number of electrons in a neutral atom equals the number of ___ | protons |
| A neutral object develops a negative charge when it ____ electrons | gains |
| Materials that do not allow electrons to flow freely are called | insulator |
| True/False Rubber is a relatively poor conductor of electricity. | true |
| True/False A photocell generates electricity as results of temperature differences. | false |
| True/False if a circuit breaker burns out, it must be replaced. | false |
| True/False An electric circuit provides a complete open path for an electric path. | false |
| True/False Electric power is the rate at which work is done. | true |
| Electric current is measured in units called | amperes |
| a measure of the potential difference across a source is | voltage |
| Voltage is measured in units called | volts |
| resistance is measured in units called | ohms |
| Electric charges can be made to flow by a source such as a (name four) | battery, themocouple, photocell, electric generator |
| a netural object can acquire a charge by | friction, conduction, or induction |
| the following website is a matching section that will disucss conductors | http://www.quia.com/servlets/quia.activities.common.ActivityPlayer?AP_rand=577008224&AP_activityType=14&AP_urlId=25645&AP_continuePlay=true&id=25645 |
