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Science Ch 4 review
energy
| Question | Answer |
|---|---|
| Lesson 1:An object with extra electrons is.. | negative |
| An object with too few electrons is.. | positive |
| objects with like charges | repel |
| objects with unlike charges | attract |
| what is step one in a flashlight circuit | electrons leave the negative end of the battery |
| what is step two in a flashlight circuit | electrons move through the wire (conductor) |
| what is step three in a flashlight circuit | electrons enter the lightbulb and move through a tiny wire inside the bulb. The wire glows. |
| what is step four in a flashlight circuit | electrons leave the bulb and are pulled through the wire |
| what is the final step in a flashlight circuit | electrons move into the positive end of the battery |
| Lesson 2 What special switch is used to break a circuit in older homes | fuse |
| what place in the home contains the circuit breakers | circuit box |
| what part of a circuit opens or closes the circuit | the switch |
| Name a special switch that uses a built-in thermometer to control temperature | thermostat |
| what special switch is used to change the brightness of light | dimmer switch |
| what unit is used to measure the amount of electrica energy | kilowatt hour |
| what are the three basic parts of a generator | drive shaft, a strong magnet, a coil of wire |
| What are the two opposite magnetic poles | north and south |
| when do the two poles attract each other | opposite poles attract |
| when do the two magnetic poles repel each other | when the poles are alike |
| a generator is used to change ___________ energy into ___________ energy | mechanical into electrical |
| what kind of magnet is used in generators | electromagnet |
| Name one way a generator can produce electricity | by turning a magnet inside a coil of wire |
| Name a second way a generator can produce electricity | by moving a coil of wire near a magnet |
| what must be provided to an electrical generator before the drive shaft and the magnet of the generator can turn | A source of mechanical energy is needed to turn the drive shaft and the magnet of the generator |
| Name eight energy sources that supply the power for generators | coal, oil, nuclear, hydroelectric (water), geothermal, wind, tidal, wave energy |
| when electricity flows through a wire the wire becomes.. | magnetic |
| giant sparks of electic charges are called | lightning |
| An electic generator uses a.... | magnet |
| Metal is an example of a good electrical.. | conductor |
| 5 kilowatts equals | 5,000 watts |
| electric bills are based on how many _________ are used | kilo-watt hours |
| plastic is an example of a good electrical___ | insulator |
| how can two neutral objects become charged | by rubbing |
| what unit measures how strongly the electrons in a wire are pushed | volt |
| a generator is run by a.... | drive shaft |
| which special switch does not protect | dimmer switch |
| a battery in a flashlight changes _______ energy to _____________ energy | chemical to electrical |
| 7,000 watts equals ___________ kilowatts | 7 kw |
| the part of an atom that can be rubbed off is the... | electron |
| the flow of electricity in a circuit is controlled by a | switch |
| mechanical energy is changed into electrical energy by a | generator |
| electricity can make | magnetism |
| protons attract | electrons |
| magnetic forces can attract without | touching |
| what safety device is built into a small applicance such as a hair dryer | a GFCI plug |
| the electric charge of protons is | positive |
| 7,000 watts equals ___________ kilowatts | 7 kw |
| the part of an atom that can be rubbed off is the... | electron |
| the flow of electricity in a circuit is controlled by a | switch |
| mechanical energy is changed into electrical energy by a | generator |
| electricity can make | magnetism |
| protons attract | electrons |
| magnetic forces can attract without | touching |
| what safety device is built into a small applicance such as a hair dryer | a GFCI plug |
| the electric charge of protons is | positive |
Created by:
ddolan
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