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24 Cards in this Set
- Front
- Back
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Electric force depends on what two things
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charge and distance
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the size of an electric force increases as the anount of charge increases
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true
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the size of the electric force increases as the distance between the objects increases
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False, as the distance decreases
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when a glass rod is rubbed with wool it becomes positively charged why?
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electrons move to the wool
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opposite charges will
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attract
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like charges will
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repel
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explain what happens to your hair when you touch a Van de Graf generator
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hair becomes negitvely charged and all hairs have the same charge causing them to repel against each other and stick out
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if you rub your hair with a balloon what does it gain
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static electric enegery
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what is the purpose of a generator
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it converts mechiicanical/ kinetic enegery to electrical energy
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what is the purpose ofan electric motor
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to convert electric energy to mechinical/kinetic energy
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what is the job of a transformer
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to increase voltage or decrease voltage
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give an example of a device that would convert electrical energy to heat energy
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toaster,microwave, space heater, hair dryer
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define current
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amount of charge passing through speciic current
ameres when volt is diveded he resistanste of the flow of electrical charges |
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true or false electrical current always flows from an area of low potential energy to high potential energy
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false, high potential energy to high potential energy
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identify three things that would affect a materials resistance
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length of material, material temperature, temperature of material
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what is resistance caused by
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internal friction, length, temperature and typ of material
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true or false, potential differences cause electrons to move from the positive to negeative terminal
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false move from negetive to positive
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as the distance from a magnet increases, what happens to its magnetic field strength
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inversely proportional magnetic field decrese
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name three places a magnetic field can exist
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near a magnet
on a magnet (within the magnet) farther away from a magnet |
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where is a magnet the strongest
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poles
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what makes a series circuit
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its a complete circuit with only one path for the current to take
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what makes a parallel circuit
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There is several branches for the current to take
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what is the difference between a closed and an open circuit
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open- current interuppted
closed- current flows |
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when would there be potential for a short circuit
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when two or more wires cross or when the alternate travel path bypasses the resistor
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