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chap 17mmmmmmm
| Question | Answer |
|---|---|
| 21. Cell | device that produces an electric current by converting chemical energy into electrical energy |
| 22. Battery | converts chemical energy into electrical energy and also made of several cells |
| 23. Parts of a battery – electrolyte & electrode | lyte-convert chemical energy into electrical energy, rode-part of a cell charges into and exit |
| 24. Types of Battery Cells | wet cells-contain liquid electrolytes amd dry cells have elerclytes that are solid and pastelike |
| 25. What is the relationship between potential difference & volts | potential difference is expressed in volts |
| 26. Photocells & examples | part of a solar panel that converts light into electrical energy solar panels and calculator |
| 27. Thermocouple | thermal energy into electrical energymade by joining wires of different metals into loop |
| 28. Drawing of thermocouple | |
| Section 3 & 4 | |
| 29. Electrical current p. 433 | rate at which charge passes a given point |
| 30. Two types of electrical current | direct charge has one direction and alternate current continually change direction |
| 31. Direct Current & diagram | has one direction |
| 32. Alternating Current & diagram | continually change direction |
| 33. Voltage | difference in energy per unit chargeas a charge moves between to points in a path of a current |
| 34. Resistance | opposition to the flow of eletrical charge |
| 35. What is the relationship between resistance & current | determines the current in the wire |
| 36. How thickness, length & temperature effect electrical current | thick wires have less resistance than thin wires and long wires have more ressistance than short wires, resistnane of metals increses as temperature increases because atome move faster at higher temperature and get in the way of flow |
| 37. What is Ohm’s Law? | amperes equals volts over ohms |
| 38. Electrical Power Formula | power equals voltage times current |
| 39. Watt | unit for power |
| 40. How is household energy measured by the energy company | multiplying the power in kilowatts by the time in hours |
| law of elecrtal charge | like chasrges repel and opposites attract |
| electric frorce | the force between charged objects |
| electric feild | region around a charged particlethat excert a force onto another charged particle |
| friction | transfer my electrons |
| conduction | direct contact |
| induction | rearranged without direct contact |
| consevation of charge | no charges r created or destroyed |
| electroscvope | dtermine charge |
| conductor | material where charges move easily ex= blowdryer,copper metal |
| insulater | material where charges dont move easily ex=plastic,glass,wood |
| static electricity | biuld up of electrical charge n a object |
| lightning | atmosphere electrical discharge |
| lightning rods | pointed rods connect to ground by wire |
| grounded | objects that r n contact with earth |
| lightning dangers | uner tree, humand open areas |
| Circuit | complete closed path through which electrical charges flow |
| .Load | a device that uses a electrical energy to work |
| What do ALL loads do ? | offer some resistance to electrical current and cause the elctrical energy to change into other forms of energy |
| Explain the relationship that a switch plays in “opening” or “closing” a circuit | a swicth opens and closes a circuit |
| Series circuit | a circuit in which all parts are connected to a single loop |
| How many paths are in a series circuit? | one |
| Explain what happens if one load in the series circuit is malfunctioning. | the other loads will not work |
| Parallel circuit | a circuit in which different loads are located on seperate bramches |
| Why is this circuit important in the wiring of the lights in a building ? | if one load is turned off the other will still work |
| Explain what happens if one load in the parallel circuit is malfunctioning. | the other loads will still work |
| Give an example of a parallel circuit in your house. | the lights |
| Using the last paragraph p. 444 and fig. 26, explain the causes and dangers of overloading a circuit | if too many loads or devices are attached to it cause the current to rise to an unsafe level and increase the temperature of the wires and cause a fire |
| Explain how a fuse and circuit breakers help with circuit safety in your house and automobile | a fuse will blow and stop the current from flowing and circuit breakers open if the current is to high |
Created by:
Lakeia
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