When directed drift takes place, at what speed does the effect take place?
186,000 miles per second
Which of the following values is equal to 100mA?
What is the total number of connections on (a) a rheostat and (b) a potentiometer?
(a) Two (b) three
An atom that contains 6 protons and 5 electrons has what electrical charge
What is the specified reliability of the resistor?
What is the main difference between conductors, semiconductors, and insulators?
The physical state of their mass
What subatomic particle has a positive charge and a large mass?
What material is MOST widely used as a conductor in electrical equipment?
The ability of a material to retain magnetism is called
A magnetic shield or screen used to protect a delicate instrument should be made of which of the following materials?
What is the general term that describes a device which supplies a voltage?
A voltage source
A substance with an excess of electrons is considered to be in what electrical state?
Bar magnets should be stored in which of the following manners?
In pairs with a north pole and a south pole together
If low weight is the major factor, which of the following materials should be used as a conductor?
A material with low reluctance and high permeability such as iron or soft steel is used to make what type of magnet?
When light is represented as a tiny packet of energy, what are these packets of energy called?
Current in an electric circuit is caused by which of the following actions
Electrons moving from negative to positive
Which of the following devices use magnetism?
What subatomic particle has no charge?
When an atom gains or loses an electron, which of the following terms applies?
Which of the following types of resistors will overcome the disadvantages of a carbon resistor?
A book sitting on a shelf has what kind of energy?
Matter can be found in which of the following forms?
An imaginary line used to illustrate a magnetic effect is known as a/an
magnetic line of force
Electrostatic lines of force are drawn in which of the following manners?
Entering negative charge, leaving positive charge
Which of the following units is NOT a unit of conductance?
Which of the following term(s) apply(ies) to the difference of potential between two bodies?
• Electromotive force
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?
The magnetic field
What is the term applied to the ability to do work?
A material whose resistance decreases as the temperature increases has what temperature coefficient?
The law of magnetic poles states which of the following relationships
like poles repel, unlike poles attract
Magnetic materials have which of the following qualities?
They are attracted by magnets
• They can be magnetized
What subatomic particle has a negative charge and a small mass?
How do "like" and "unlike" charges react to one another?
Unlike charges attract each other, like charges repel each other
Which, if any, of the following types of variable resistors is used to control a large amount of current?
Resistance bears which, if any, of the following relationships to conductance?
A reciprocal relationship
Resistance of a conductor will increase with which of the following changes to the cross-sectional area and length of the conductor?
Cross-sectional area is decreased, length is decreased
What is/are the term(s) applied to the space between and around charged bodies in which their influence is felt?
• Electric field of force
• Electrostatic field
• Dielectric field
A molecule is the smallest possible particle that retains the characteristic of which of the following substances?
An object that is in motion has what type of energy?
If the voltage in a circuit increases, what happens to the current?
What is the specified tolerance of the resistor?
An atom is the smallest possible particle that retains the characteristic of which of the following substances?
The north indicating pole of a compass needle is attracted to which of the following poles of the earth?
The magnetic south pole
How is the ability of a resistor to dissipate heat indicated?
By the wattage rating
The number of electrons in the outermost shell of an atom determines which of the following characteristics of the atom?
Weber's theory of magnetism assumes that magnetic material is composed of
tiny molecular magnets
A material whose resistance remains constant as the temperature increases has what temperature coefficient?
A substance that CANNOT be reduced to a simpler substance by chemical means is called a/an
According to the domain theory, if an atom with 26 electrons has 20 electrons spinning counterclock-wise, the atom is considered to be
Which of following actions describes the easiest way to accumulate a static electric charge?
Friction between two insulators
Which of the following terms is equal to "2.1 kV?"
Ferromagnetic materials have which of the following qualities?
They are relatively easy to magnetize
Carbon resistors have which of the following disadvantages?
The resistance value changes with age
Which of the following is NOT a property of magnetic lines of force?
They cross each other at right angles
In addition to friction, magnetism, and chemical action, which of the following methods can be used to produce a voltage?
If light energy collides with an orbiting electron, what happens to the electron?
The electron will jump to an orbit further from the nucleus