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Science Ch 4 review

energy

QuestionAnswer
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 on 2009-03-29



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