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61 Cards in this Set
- Front
- Back
Matter can be found in which form(s)
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Solid
Liquid Gaseous |
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A substance that CANNOT be reduced to a simpler substance by chemical means is called a/an
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Element
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A molecule is the smallest possible particle that retains the characteristic of which substances
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A compound
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An atom is the smallest possible particle that retains the characteristic of which substance
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An element
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What subatomic particle has a negative charge and a small mass
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Electron
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What subatomic particle has a positive charge and a large mass
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Proton
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What subatomic particle has no charge
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Neutron
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When light is represented as a tiny packet of energy, what are these packets of energy called
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Photons
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If light energy collides with an orbiting electron, what happens to the electron
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The electron will jump to an orbit further from the nucleus
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After the electron jumps into an orbit further from the nucleus, the electron will return to the condition it had before being acted upon by the light. When the electron returns to this condition, what action occurs
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Light energy is emitted
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The number of electrons in the outermost shell of an atom determines what characteristic of the atom
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Valence
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When an atom gains or loses an electron, what term applies
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Ionized
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What is the main difference between conductors, semiconductors, and insulators
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The number of free electrons
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A substance with an excess of electrons is considered to be in what electrical state
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Negative
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What action is the easiest way to accumulate a static electric charge
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Friction between two insulators
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An atom that contains 6 protons and 5 electrons has what electrical charge
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Negative
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How do "like" and "unlike" charges react to one another?
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Unlike charges attract each other, like charges repel each other
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What is/are the term (s) applied to the space between and around charged bodies in which their influence is felt
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Electric field of force
Electrostatic field Dielectric field |
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Electrostatic lines of force are drawn in which manner
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Entering negative charge, leaving positive charge
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True or False. High-fidelity speakers use magnetism.
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True
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Magnetic materials have what qualities
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They are attracted by magnets
They can be magnetized |
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Ferromagnetic materials have what quality
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They are relatively easy to magnetize
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A material with low reluctance and high permeability such as iron or soft steel is used to make what type of magnet
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Temporary
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The ability of a material to retain magnetism is called
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Retentivity
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The law of magnetic poles states what on its relationship
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Like poles repel, unlike poles attract
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The north indication pole of a compass needle is attracted to which pole of the earth
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The magnetic north pole
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Weber's theory of magnetism assumes that magnetic material is composed of
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Tiny molecular magnets
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According to the domain theory, if an atom with 26 electrons has 20 electrons spinning counterclockwise, the atom is considered to be
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Magnetized
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If a glass plate is placed over a magnet and iron filings are sprinkled over the glass, a pattern will be visible. What does this pattern indicate
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The magnetic field
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An imaginary line used to illustrate a magnetic effect is known as a/an
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Magnetic line of force
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A magnetic shield or screen used to protect a delicate instrument should be made of what material
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Soft-iron
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Bar magnets should be stored in what manner
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In pairs with a north pole and a south pole together
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What is the term applied to the ability to do work
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Energy
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An object that is in motion has what type of energy
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Kinetic
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A book sitting on a shelf has what kind of energy
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Potential
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What term(s) apply(ies) to the difference of potential between two bodies
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Voltage
Electromotive force |
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What terms is equal to "2.1 kV"
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2.1x10^6 V
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What is the general term that describes a device which supplies a voltage
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A voltage source
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In addition to friction, magnetism, and chemical action, what method(s) can be used to produce a voltage
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Pressure
Heat Light |
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What voltage producing method is used for radio receiver's oscillator
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Pressure
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What voltage producing method is used for thermocouples
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Heat
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What voltage producing method is used for automobile batteries
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Chemical action
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What voltage producing method is used for automobile generators
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Magnetism
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What voltage producing method is used for flashlight cells
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Chemical action
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Current in an electric circuit is caused by what actions
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Electrons moving from negative to positive
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When directed drift takes place, at what speed does the effect take place
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186,000 miles per second
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If the voltage in a circuit increase, what happens to the current
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Current increases
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If low weight is the major factor, which material should be used as a conductor
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Aluminum
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What material is MOST widely used as a conductor in electrical equipment
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Copper
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Resistance of a conductor will increase with what changes to the cross-sectional area and length of the conductor
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Cross-sectional area is decreased, length is increased
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A material whose resistance decreases as the temperature increases has what temperature coefficient
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Negative
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A material whose resistance remains constant as the temperature increases has what temperature coefficient
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Zero
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True or false. Ohm is a unit of conductance
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False
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Resistance bears what kind of relationship to conductance
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A reciprocal relationship
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How is the ability of a resistor to dissipate heat indicated
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By the wattage rating
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Carbon resistors have which of the following disadvantages
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A limited range of resistance values
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What types of resistors will overcome the disadvantage of a carbon resistor
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Wirewound resistor
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What is the total number of connections on (a) a rheostat and (b) a potentiometer
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(a) Two (b) Three
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What type of variable resistors are used to control a large amount of current
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Wirewound potentiometer
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A carbon resistor is color-coded orange, orange, orange. What is the resistance value of this resistor
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33.0k Ohms
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What are the allowable limits of ohmic value in a resistor color coded blue, green, yellow, gold
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682.5k to 617.5 k Ohms
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