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51 Cards in this Set
- Front
- Back
Electrostatic charge results from? |
Transfer or redistribution of electrons |
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The unit of electric charge is the? |
Coulomb |
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An electric field describes the condition of space around? |
A charged particle |
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A material that has electrons that are free to move throughout the material is a(n) |
Electric conductor |
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What's an example of an electrical insulator is? |
Glass |
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The electrical potential difference between two points in a circuit is measured in units of? |
Volt |
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The rate at which an electric current flows through a circuit is measured in units of ? |
Amp |
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The law that predicts the behavior of electrostatic forces acting through space is |
Coulombs law |
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what type of electric current is produced by fuel cells and solar cells |
Dc |
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the electrical resistance of a conductor is measured in units of? |
Ohm |
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According to ohms law what must be the greater to maintain the same current in a conductor with more resistance |
Voltage |
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A kilowatt per hour is a unit of |
Work |
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If you multiply volts by amps the answer will be in units of |
Power |
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Units of joules per second are a measure called a |
Watt |
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A lodestone is a natural magnet that attracts |
Iron,cobalt,nickel |
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The North Pole of a suspended or floating bar magnet currently. Directly towards Earths |
North Magnetic pole |
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A current carrying wire always has |
A magnetic field with closed concentric field lines around the length of the wire |
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Magnetism is produced by |
Moving charges |
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Earths magnetic field |
Has undergone many reversals in polarity |
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The strength of magnetic field around a current-carrying wire varies directly with the |
Amperage of the current |
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Reverse the direction of a current in a wire and the magnetic field around a wire will |
Have a reversed North Pole direction |
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The operation of which of the following depends on the interaction between the two magnetic fields |
Car stereo speakers, Telephone, Relay circuit |
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An electric meter measures the |
Strength of a magnetic feild |
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When I lubb of wire cut across magnetic field lines or magnetic field lines move across a loop of wire |
Electrons are pushed toward one end of the loop |
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A step up transformer steps up the |
Voltage |
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Electromagnetic induction occurs when recording of wire cut across magnetic field lines which one of the following increases the voltage produced |
Increased strength of magnetic field |
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Electric Power Company step up the voters are generated power for transmission across the country because higher voltage |
Reduces the current which lowers the energy lost to resistance |
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A solar cell |
Produces electricity directly |
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Which of the following is most likely to acquire an electrostatic charge |
Electrical nonconductor |
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Which of the following units are measures of rates |
Amp and watt |
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You are using which description of a current if you consider a current to be positive charges that flow from a positive to the negative terminal of a battery |
Conventional current |
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In an electric current the electrons are moving |
At a very slow rate |
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In which of the following Curren is there no electron movement from one end of the conducting wire to the other end |
Alternative current |
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If you multiply amps. Volts the answer will be in units of |
Power |
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A permanent magnet has magnetic properties because |
the magnetic domains are aligned |
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a current carrying wire has a magnetic field around it because |
A moving charge produces a magnetic field of its own |
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When an object acquires a negative charge it actually |
Gains mass |
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A positive and negative charge are initially 2 centimeters apart what happened to the force on each as they are moved closer and closer together? The force |
Increases while moving |
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To be operational a complete electric circuit must contain a source of energy a device that does work and |
A conductor from the source to the working device and another conductor back to the source |
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Which variable is inversely proportional to the resistance |
Cross-sectional area of conductor |
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Which of the following is not considered to have strong magnetic properties |
Silver |
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A piece of iron can be magnetized or unmagnetized this is explained by the idea that |
Atoms of iron are grouped into tiny magnetic domains that may orient themselves in a particular direction or in a random of direction |
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Are magnetic field is believed to originate |
With electric currents that are somehow generated in Earth's core |
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This speaker in a stereo system works by the action of |
And electro-magnetic pushing and pulling on a permanent magnet |
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Electromagnetic induction takes place because |
Electrons have their own magnetic field which interacts with an externally applied magnetic field |
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The current in the secondary cool of a transformer is produced by |
Varying magnetic field |
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An electromagnetic uses |
An electric current to produce a magnetic field |
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A transformer |
Changes the voltage of an alternating current |
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A parallel circuit has |
Separate pathways for the current to flow through |
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In which type of circuit would you expect a reduction of the available voltage as more or more resistance are added to the circuit |
Series circuit |
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In which type of circuit would you expect the same voltage with an increase current as more and more resistance are added to the circuit |
Parallel circuit |