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47 Cards in this Set
- Front
- Back
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who is Allesandro Volta? |
he is the man credited with discovering electric potential. the units (volts) were names in his honor. |
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how is energy stored ? |
a capactior |
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what is a Van de Graff generator used for? |
it is used to create electric charge in a laboratory |
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what is a vector? |
an arrow that represents magnitude and direction |
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what is another name of electric field lines? |
lines of force |
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what happens to the electric field when the electric field lines are closer together? |
they are stronger |
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what is a volt? |
the SI unit of electric potential |
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how is the magnitude of the electric field measured? |
by looking at the effect on charges located within the field. |
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is an electric field a vector? |
yes, because it has both magnitude and direction |
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an electronic device that restricts current to flow in a single direction in an electric current |
define diode |
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a device used to store charges |
define capacitor |
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when is charge distribution uniform (equal)? |
when the charged object is spherical |
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why can't we shield gravity? |
gravity is only a pull, never a push. if there is no repulsive property, you cannot shield the electric field. |
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be able to draw the electric field between objects that have the same charge |
DO IT |
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be able to draw the electric charge between a positive and a negatively charged object |
DO IT |
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what happens inside a conductor when the electric charge is 0? |
zero charge means the charge is not moving. if it is not moving, it is static and will not move until it is discharged |
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electric potential |
define voltage |
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how is electric potential energy similar to gravitational potential energy? |
both depend on the distances between the two objects and their masses. |
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in electrical potential what does the distance between the particle mean? |
closer=stronger energy |
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what is the purpose of field lines? |
they show the path of electric charge |
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how is an electric field different from gravity force field? |
gravity is only a pull whereas an electric field can push and pull. |
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what happens to field lines if the charge is positive? |
they move outward away from the charge |
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what direction do charges move? |
from positive negative |
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how do we shield electric field? |
we shield objects from electric fields by surrounding the objects with materials that will cancel out the charge. |
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why would we need to shield ourselves from an electric field? |
to prevent an overload on charge or to prevent shocking ourselves |
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how does the van de graph generator work? |
the electrons are supplied by the material brushing near the bottom of the belt and transferred to the dome at the top. |
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how can you increase the voltage of the van de graff generator? |
by increasing the radius of the sphere or by placing the entire system in a container filled with high pressured gas |
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who is nikola tesla? |
he is the developer of wireless energy and the tesla coil. |
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a force field that fills the space around every electric charge or group of charges |
electric field |
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energy a charge has due to its location in an electric field |
electric potential energy |
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a device used to store electric charge in a circuit |
capacitor |
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an imaginary line or curved ina field of force as an electric field such as the direction of the line at anypoint is that of the force in the field at any point |
field lines |
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a charged dome of an electrostatic machine |
Van de Graff generator |
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an arrow whose length represents magnitude and direction |
vector |
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the SI unit of electric potential |
volt |
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electrons in the circuit move first in one direction and then in the opposite direction, alternating back and forth about relatively fixed positions |
alternating current |
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SI unit of electric current. |
ampere |
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the flow of electric charge; measured in amperes |
current |
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an electronic device that restricts current to flow in a single direction in an electric circuit |
diode |
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electric current whose flow of charge is always in one direction |
direct current |
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the flow of electric charge; measured in amperes electric current |
the rate at which electrical energy is converted into another form; such as light, heat, and mechanical energy |
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the resistance of a material to the flow of the electrical current through it |
electric resistance |
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the SI unit of electrical resistance |
ohm |
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the statement that the current in a circuit is directly proportional to the voltage impressed across the circuit, and is inversely proportional to the resistance of the circuit |
ohm's law |
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the difference in electric potential between two points |
potential difference |
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the rate at which work is done or energy is transformed |
power |
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a device that that provides a potential difference |
voltage source |
