| A | B |
|---|
| A________ _______ ia a region around a charged object where the object's electric force is exerted on other charged objects. | electric field |
| ________ _____ is the relationship among resistance, voltage, and current. | George Ohm |
| List three potential dangers of damaged wires | short circuits, electric shock, underground wire |
| Give five examples of good insulators | Rubber, glass, sand, plastic, wood |
| T or F Charges that are different repel each other. | False |
| T or F Potential difference means the same thing as voltage | True |
| A circuit has a ______ of electrical energy | source |
| A _______ is a combination of two or more eletrochemical cells in a series | Battery |
| Electric power is usuallt measured in thousands of watts, or _________ and time is measure in ______ . | Kilowatts (KW), hours |
| ____ _________ is energy stored in chemical componds. | Chemical energy |
| What are the two the kinds of electrochemiccal cells. | Dry cell Wet cell |
| ________ _______ is the continuous flow of eletric charges through material. | Electric current |
| What is one way to protect people from electric shock or other eletrical dangers? | Provide an alternative path for electric current |
| The rate at which energy is transformed from one form to another is known as ________ . | Power |
| The Law of Conservation of charge states : | Charges are not created or destroyed |
| The difference in electrical potential energy between two places in a circuit is called __________ _________ or ___________ . | potential differences voltage |
| Who was responsible for the development of the battery in the 1780s ? | Luigi Galvani |
| In a ________ ________ , all the parts of the circuit are connected one after another along one path. | Series circuit |
| If an object _______ electrons, it has an overall positive charge. | loses |
| A _______ _______ is a device that createsa a potential difference in an electric circuit | voltage source |
| The loss of static electricity as electric charges transfer from one object to another is called _____ ________ . | Static charge |
| Give an example of a dry cell | Flash lights |
| The unit of power is the ________ ( ) | Watts w |
| A _____ _____ is a resuable safety switch that breaks the circuit when then current gets too high. | Circuit breaker |
| What Italian scientist hypothesized that Galvani's observation was actually a result of a chemical reaction? | Volta |
| Ohm's Law states: | The resistence is equal to the voltage divided by the current |
| A current ______ than ____ can be dangerous, causing burns or even stopping the heart. | greater than 0.2 |
| _________is the measure of how difficult it is for charges to flow through material. | Resistance |
| The interaction between electric charges is called ________ . | Electricity |
| The _________ the resistance, the _____ current there is for a given voltage. | greater less |
| T or F In a series circuit, there are two paths for the currents to take. | True |
| A _____ _______ is a process in which substances charge into new substances with different properties | Chemical reaction |
| Charging by ________ is the transfer of electrons from a charge object to another by direct contact. | conduction |
| Circuits have _______ that are run by _______ ______ . | devices electrical energy |
| T or F Charges can be created and destroyed | False |
| The unit of measure for resistance is ______ | Ohm |
| The build up of charges on an object is called ______ _______ | Satic electricity |
| A(n) _________ does not transfer electric charges well. | insulator |
| A _____ ______ is a connection that allows current to take the path of least resistance. | short circuit |
| A ____ ____ is an electrochemical cell in which the electrolyte is paste. | Dry cell |
| Volta built the first electric battery by layering _____, paper soaked in ____ ______. and _______ . | Zinc salt water silver |
| What does static mean? | not moving or changing |
| What two factors does the power of a light bulb or an appliance depend on? | Voltage and circuit |
| The unit of measure for voltage is _______ | The Volt (V) |
| ______ ________ is the attraction or repulsion between electric charges. | Electric force |
| What are four factors that determine the resistance of a wire, or any object? | material of wire, lenght, diameter, temperture of wire |
| If an object ____ electrons, it has an overall negative charge. | gains |
| What is one disadvantage of using a fuse? | If there is too much current it will melt |
| A(n) _____ ______ is a device that transforms chemical energy into electrical energy. | Electro chemical |
| A _________ is a device used to measure voltage. | Volmeter |
| The unit for rate of current is the ______ ( ) or ( ) . | Ampere. Amp, A |
| In static electricity, charges ______ ___ on an object, but they _____ flow continuously. | build up don't |
| What is the formula for Ohm's Law? | resistence = voltage over current |
| An electrochemical cell is made of two different metals called: | Electrodes |
| To produce electric current, charges must flow __________ from one place to another. | continuously |
| Current requires a(n) ______ ________, which is a complete, unbroken path through which electric charges can flow. | Electric circuit |
| You can measure current in a circuit by connecting a(n) ___________ in series. | Ammeter |
| A(n) _________ is a substance that conducts electric current. | Electrolyte |
| The _____ _______ connects any metal pieces of an appliance to the ground wire of the building | third prong |
| An electrochemical cell in which the electrlyte is liquid is a ____ _____ . | wet cell |
| What are the three methods by which charges can be transferred to build up static electricity? | Charging by friction, conduction, induction |
| Charges that are _______ repel each other. | same |
| In a _____ ______ , the different parts of the circuit are on separate branches. | Paralled circuit |
| A ______ is a material through which charge can easily flow. | conductors |
| Give an example of a spark of static electricity. | lighting |
| A _________ is a device used to measur current. | Ammeter |
| The part of an electrode above the surface of the electrolyte is a ________ . | terminal |
| Electrical circuits are ________ by _________ ______ . | connected conducting wires |
| Charging by _______ is movement of electrons to one part of an object that is caused by the electric field of a seconde object. | Induction |
| The thrid prong is usually _________ . | Round |
| In order to prevent circuits from overheating, devices called ______ and _______ ______ are added to circuits. | Fuse circuit breakers |
| A material through which charges cannot flow easily is called a _________ . | Insulator |
| Charges that are_________ attract each other. | Different |
| What is the formula to calculate power ? | Power =voltagte x current |
| Give four examples of good conductotrs. | mentals, silver, copper, irion, aluminum |
| Charging by _________ is the transfer of electrons from one unchanged object to another by rubbing. | friction |
| The electrical resistance of most materials ________ as temperature ______ . | Increase & Increase |
| Terminals are used to connect the ____ to a ________ . | cell circuit |
| A _____ is a device that contains a thin stripe of mental that will melt if there is too much current through it. | Fuse |
| Energy use depends on _____ & time. | Power & Time |
| When chemical reactions occur between the electrolyte and the electrodes, one electrode becomes _________ charged and the other becomes _________ charged. | Negatively Positively |
| A circuit is electrically __________ when charges are able to flow directly from the circuit into Earth in the event of a short circuit. | Grounded |
